Kill PreprocessorFactory, which was both morally repugnant and totally unused.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@86076 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Frontend/PlistDiagnostics.cpp b/lib/Frontend/PlistDiagnostics.cpp
index a83dca0..a10ecd4 100644
--- a/lib/Frontend/PlistDiagnostics.cpp
+++ b/lib/Frontend/PlistDiagnostics.cpp
@@ -29,7 +29,6 @@
 
 namespace clang {
   class Preprocessor;
-  class PreprocessorFactory;
 }
 
 namespace {
@@ -63,8 +62,7 @@
 }
 
 PathDiagnosticClient*
-clang::CreatePlistDiagnosticClient(const std::string& s,
-                                   Preprocessor *PP, PreprocessorFactory*,
+clang::CreatePlistDiagnosticClient(const std::string& s, Preprocessor *PP,
                                    PathDiagnosticClientFactory *PF) {
   return new PlistDiagnostics(s, PP->getLangOptions(), PF);
 }