[C++11] Add 'override' keyword to virtual methods that override their base class.

llvm-svn: 203999
diff --git a/clang/lib/Rewrite/Frontend/FixItRewriter.cpp b/clang/lib/Rewrite/Frontend/FixItRewriter.cpp
index c2083c5..8b7af71 100644
--- a/clang/lib/Rewrite/Frontend/FixItRewriter.cpp
+++ b/clang/lib/Rewrite/Frontend/FixItRewriter.cpp
@@ -62,10 +62,10 @@
 public:
   RewritesReceiver(Rewriter &Rewrite) : Rewrite(Rewrite) { }
 
-  virtual void insert(SourceLocation loc, StringRef text) {
+  void insert(SourceLocation loc, StringRef text) override {
     Rewrite.InsertText(loc, text);
   }
-  virtual void replace(CharSourceRange range, StringRef text) {
+  void replace(CharSourceRange range, StringRef text) override {
     Rewrite.ReplaceText(range.getBegin(), Rewrite.getRangeSize(range), text);
   }
 };