blink: Cleanup core class forward declarations

third_party/WebKit/Source/core/observer/ResizeObserver.h

 // Copyright 2016 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 ResizeObserver_h
 #define ResizeObserver_h
 
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class Document;
 class Element;
 class ResizeObserverCallback;
 class ResizeObserverController;
-class ResizeObserverEntry;
 class ResizeObservation;
 
 // ResizeObserver represents ResizeObserver javascript api:
 // https://github.com/WICG/ResizeObserver/
 class CORE_EXPORT ResizeObserver final
     : public GarbageCollectedFinalized<ResizeObserver>,
       public ScriptWrappable {
   DEFINE_WRAPPERTYPEINFO();
 
  public:
@@ skipping 28 matching lines @@
   // True if observations were skipped gatherObservations
   bool m_skippedObservations;
   // True if any ResizeObservation reported size change
   bool m_elementSizeChanged;
   WeakMember<ResizeObserverController> m_controller;
 };
 
 }  // namespace blink
 
 #endif  // ResizeObserver_h