Rewrite references to "wtf/" to "platform/wtf/" in core/editing.

third_party/WebKit/Source/core/editing/serializers/TextOffset.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef TextOffset_h
 #define TextOffset_h
 
+#include "platform/wtf/Forward.h"
 #include "public/platform/Platform.h"
-#include "wtf/Forward.h"
 
 namespace blink {
 
 class Text;
 
 class TextOffset {
   STACK_ALLOCATED();
 
  public:
   TextOffset();
   TextOffset(Text*, int);
   TextOffset(const TextOffset&);
 
   Text* GetText() const { return text_.Get(); }
   int Offset() const { return offset_; }
 
   bool IsNull() const;
   bool IsNotNull() const;
 
  private:
   Member<Text> text_;
   int offset_;
 };
 
 }  // namespace blink
 
 #endif  // TextOffset_h