Rewrite references to "wtf/" to "platform/wtf/" in platform/testing.

third_party/WebKit/Source/platform/testing/FakeDisplayItemClient.h

 // Copyright 2014 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 FakeDisplayItemClient_h
 #define FakeDisplayItemClient_h
 
 #include "platform/geometry/LayoutRect.h"
-#include "wtf/Forward.h"
+#include "platform/wtf/Forward.h"
 
 namespace blink {
 
 // A simple DisplayItemClient implementation suitable for use in unit tests.
 class FakeDisplayItemClient : public DisplayItemClient {
  public:
   FakeDisplayItemClient(const String& name = "FakeDisplayItemClient",
                         const LayoutRect& visualRect = LayoutRect())
       : m_name(name), m_visualRect(visualRect) {}
 
   String debugName() const final { return m_name; }
   LayoutRect visualRect() const override { return m_visualRect; }
 
   void setVisualRect(const LayoutRect& r) { m_visualRect = r; }
 
   // This simulates a paint without needing a PaintController.
   void updateCacheGeneration() {
     setDisplayItemsCached(CacheGenerationOrInvalidationReason::next());
   }
 
  private:
   String m_name;
   LayoutRect m_visualRect;
 };
 
 }  // namespace blink
 
 #endif  // FakeDisplayItemClient_h