diff --git a/lib/Frontend/ASTUnit.cpp b/lib/Frontend/ASTUnit.cpp
index 60e1c3b..19b8ccb 100644
--- a/lib/Frontend/ASTUnit.cpp
+++ b/lib/Frontend/ASTUnit.cpp
@@ -29,7 +29,6 @@
 #include "clang/Frontend/FrontendOptions.h"
 #include "clang/Frontend/Utils.h"
 #include "clang/Serialization/ASTReader.h"
-#include "clang/Serialization/ASTSerializationListener.h"
 #include "clang/Serialization/ASTWriter.h"
 #include "clang/Lex/HeaderSearch.h"
 #include "clang/Lex/Preprocessor.h"
@@ -775,8 +774,7 @@
   }
 };
 
-class PrecompilePreambleConsumer : public PCHGenerator, 
-                                   public ASTSerializationListener {
+class PrecompilePreambleConsumer : public PCHGenerator {
   ASTUnit &Unit;
   unsigned &Hash;                                   
   std::vector<Decl *> TopLevelDecls;
@@ -815,15 +813,6 @@
                                       getWriter().getDeclID(TopLevelDecls[I]));
     }
   }
-                                     
-  virtual void SerializedPreprocessedEntity(PreprocessedEntity *Entity,
-                                            uint64_t Offset) {
-    Unit.addPreprocessedEntityFromPreamble(Offset);
-  }
-                                     
-  virtual ASTSerializationListener *GetASTSerializationListener() {
-    return this;
-  }
 };
 
 class PrecompilePreambleAction : public ASTFrontendAction {
@@ -922,16 +911,13 @@
   
   // Clear out old caches and data.
   TopLevelDecls.clear();
-  PreprocessedEntities.clear();
   CleanTemporaryFiles();
-  PreprocessedEntitiesByFile.clear();
 
   if (!OverrideMainBuffer) {
     StoredDiagnostics.erase(
                     StoredDiagnostics.begin() + NumStoredDiagnosticsFromDriver,
                             StoredDiagnostics.end());
     TopLevelDeclsInPreamble.clear();
-    PreprocessedEntitiesInPreamble.clear();
   }
 
   // Create a file manager object to provide access to and cache the filesystem.
@@ -1407,8 +1393,6 @@
                           StoredDiagnostics.end());
   TopLevelDecls.clear();
   TopLevelDeclsInPreamble.clear();
-  PreprocessedEntities.clear();
-  PreprocessedEntitiesInPreamble.clear();
   
   // Create a file manager object to provide access to and cache the filesystem.
   Clang->setFileManager(new FileManager(Clang->getFileSystemOpts()));
@@ -1439,8 +1423,6 @@
     llvm::sys::Path(FrontendOpts.OutputFile).eraseFromDisk();
     Preamble.clear();
     TopLevelDeclsInPreamble.clear();
-    PreprocessedEntities.clear();
-    PreprocessedEntitiesInPreamble.clear();
     PreambleRebuildCounter = DefaultPreambleRebuildInterval;
     PreprocessorOpts.eraseRemappedFile(
                                PreprocessorOpts.remapped_file_buffer_end() - 1);
@@ -1511,48 +1493,6 @@
   TopLevelDecls.insert(TopLevelDecls.begin(), Resolved.begin(), Resolved.end());
 }
 
-void ASTUnit::RealizePreprocessedEntitiesFromPreamble() {
-  if (!PP)
-    return;
-  
-  PreprocessingRecord *PPRec = PP->getPreprocessingRecord();
-  if (!PPRec)
-    return;
-  
-  ExternalPreprocessingRecordSource *External = PPRec->getExternalSource();
-  if (!External)
-    return;
-
-  for (unsigned I = 0, N = PreprocessedEntitiesInPreamble.size(); I != N; ++I) {
-    if (PreprocessedEntity *PE
-          = External->ReadPreprocessedEntityAtOffset(
-                                            PreprocessedEntitiesInPreamble[I]))
-      PreprocessedEntities.push_back(PE);
-  }
-  
-  if (PreprocessedEntities.empty())
-    return;
-  
-  PreprocessedEntities.insert(PreprocessedEntities.end(), 
-                              PPRec->local_begin(), PPRec->local_end());
-}
-
-ASTUnit::pp_entity_iterator ASTUnit::pp_entity_begin() {
-  if (!PreprocessedEntitiesInPreamble.empty() &&
-      PreprocessedEntities.empty())
-    RealizePreprocessedEntitiesFromPreamble();
-  
-  return PreprocessedEntities.begin();
-}
-
-ASTUnit::pp_entity_iterator ASTUnit::pp_entity_end() {
-  if (!PreprocessedEntitiesInPreamble.empty() &&
-      PreprocessedEntities.empty())
-    RealizePreprocessedEntitiesFromPreamble();
-    
-  return PreprocessedEntities.end();
-}
-
 StringRef ASTUnit::getMainFileName() const {
   return Invocation->getFrontendOpts().Inputs[0].second;
 }
diff --git a/lib/Serialization/ASTReader.cpp b/lib/Serialization/ASTReader.cpp
index 02d7eea..25b8687 100644
--- a/lib/Serialization/ASTReader.cpp
+++ b/lib/Serialization/ASTReader.cpp
@@ -2999,16 +2999,6 @@
   return std::make_pair(BeginID, EndID);
 }
 
-PreprocessedEntity *ASTReader::ReadPreprocessedEntityAtOffset(uint64_t Offset) {
-  RecordLocation Loc = getLocalBitOffset(Offset);
-
-  // Keep track of where we are in the stream, then jump back there
-  // after reading this entity.
-  SavedStreamPosition SavedPosition(Loc.F->PreprocessorDetailCursor);  
-  Loc.F->PreprocessorDetailCursor.JumpToBit(Loc.Offset);
-  return LoadPreprocessedEntity(*Loc.F);
-}
-
 namespace {
   /// \brief Visitor used to search for information about a header file.
   class HeaderFileInfoVisitor {
diff --git a/lib/Serialization/ASTWriter.cpp b/lib/Serialization/ASTWriter.cpp
index ac961c7..2aa1e6c 100644
--- a/lib/Serialization/ASTWriter.cpp
+++ b/lib/Serialization/ASTWriter.cpp
@@ -12,7 +12,6 @@
 //===----------------------------------------------------------------------===//
 
 #include "clang/Serialization/ASTWriter.h"
-#include "clang/Serialization/ASTSerializationListener.h"
 #include "ASTCommon.h"
 #include "clang/Sema/Sema.h"
 #include "clang/Sema/IdentifierResolver.h"
@@ -1743,7 +1742,6 @@
     + NUM_PREDEF_PP_ENTITY_IDS;
   unsigned NextPreprocessorEntityID = FirstPreprocessorEntityID;
   RecordData Record;
-  uint64_t BitsInChain = Chain? Chain->TotalModulesSizeInBits : 0;
   for (PreprocessingRecord::iterator E = PPRec.local_begin(),
                                   EEnd = PPRec.local_end();
        E != EEnd; 
@@ -1757,11 +1755,6 @@
       // Record this macro definition's ID.
       MacroDefinitions[MD] = NextPreprocessorEntityID;
       
-      // Notify the serialization listener that we're serializing this entity.
-      if (SerializationListener)
-        SerializationListener->SerializedPreprocessedEntity(*E, 
-          BitsInChain + Stream.GetCurrentBitNo());
-      
       Record.push_back(NextPreprocessorEntityID);
       AddSourceLocation(MD->getSourceRange().getBegin(), Record);
       AddSourceLocation(MD->getSourceRange().getEnd(), Record);
@@ -1771,11 +1764,6 @@
       continue;
     }
 
-    // Notify the serialization listener that we're serializing this entity.
-    if (SerializationListener)
-      SerializationListener->SerializedPreprocessedEntity(*E, 
-        BitsInChain + Stream.GetCurrentBitNo());
-
     if (MacroExpansion *ME = dyn_cast<MacroExpansion>(*E)) {
       Record.push_back(NextPreprocessorEntityID);
       AddSourceLocation(ME->getSourceRange().getBegin(), Record);
@@ -2719,8 +2707,7 @@
 }
 
 ASTWriter::ASTWriter(llvm::BitstreamWriter &Stream)
-  : Stream(Stream), Context(0), Chain(0), SerializationListener(0), 
-    WritingAST(false),
+  : Stream(Stream), Context(0), Chain(0), WritingAST(false),
     FirstDeclID(NUM_PREDEF_DECL_IDS), NextDeclID(FirstDeclID),
     FirstTypeID(NUM_PREDEF_TYPE_IDS), NextTypeID(FirstTypeID),
     FirstIdentID(NUM_PREDEF_IDENT_IDS), NextIdentID(FirstIdentID), 
@@ -4045,5 +4032,3 @@
   ChainedObjCCategoriesData Data =  { IFD, CatD, 0, 0 };
   LocalChainedObjCCategories.push_back(Data);
 }
-
-ASTSerializationListener::~ASTSerializationListener() { }
diff --git a/lib/Serialization/GeneratePCH.cpp b/lib/Serialization/GeneratePCH.cpp
index 25fac8b..a2534db 100644
--- a/lib/Serialization/GeneratePCH.cpp
+++ b/lib/Serialization/GeneratePCH.cpp
@@ -46,9 +46,6 @@
 void PCHGenerator::HandleTranslationUnit(ASTContext &Ctx) {
   if (PP.getDiagnostics().hasErrorOccurred())
     return;
-
-  // Set up the serialization listener.
-  Writer.SetSerializationListener(GetASTSerializationListener());
   
   // Emit the PCH file
   assert(SemaPtr && "No Sema?");
@@ -68,10 +65,6 @@
   return &Writer;
 }
 
-ASTSerializationListener *PCHGenerator::GetASTSerializationListener() {
-  return 0;
-}
-
 ASTDeserializationListener *PCHGenerator::GetASTDeserializationListener() {
   return &Writer;
 }