drop more llvm:: prefixes on OwningPtr<>

More cleanup after r149798.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@150379 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/libclang/CXLoadedDiagnostic.cpp b/tools/libclang/CXLoadedDiagnostic.cpp
index 09049e8..d52c183 100644
--- a/tools/libclang/CXLoadedDiagnostic.cpp
+++ b/tools/libclang/CXLoadedDiagnostic.cpp
@@ -257,7 +257,7 @@
   FileSystemOptions FO;
   FileManager FileMgr(FO);
 
-  llvm::OwningPtr<llvm::MemoryBuffer> Buffer;
+  OwningPtr<llvm::MemoryBuffer> Buffer;
   Buffer.reset(FileMgr.getBufferForFile(file));
 
   if (!Buffer) {
@@ -282,7 +282,7 @@
     return 0;
   }
 
-  llvm::OwningPtr<CXLoadedDiagnosticSetImpl>
+  OwningPtr<CXLoadedDiagnosticSetImpl>
     Diags(new CXLoadedDiagnosticSetImpl());
 
   while (true) {
@@ -543,7 +543,7 @@
     return Failure;
   }
   
-  llvm::OwningPtr<CXLoadedDiagnostic> D(new CXLoadedDiagnostic());
+  OwningPtr<CXLoadedDiagnostic> D(new CXLoadedDiagnostic());
   RecordData Record;
   
   while (true) {