Remove duplicate class name, MSVC doesn't like this.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@93225 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/CIndex/CIndex.cpp b/tools/CIndex/CIndex.cpp
index 57afa86..8e579f1 100644
--- a/tools/CIndex/CIndex.cpp
+++ b/tools/CIndex/CIndex.cpp
@@ -416,7 +416,7 @@
   }
 }
 
-CXString CIndexer::CIndexer::createCXString(const char *String, bool DupString){
+CXString CIndexer::createCXString(const char *String, bool DupString){
   CXString Str;
   if (DupString) {
     Str.Spelling = strdup(String);