blink: Cleanup class/struct forward declarations

third_party/WebKit/Source/core/animation/ElementAnimation.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 28 matching lines @@
 #include "core/animation/KeyframeEffectOptions.h"
 #include "core/animation/KeyframeEffectReadOnly.h"
 #include "core/animation/TimingInput.h"
 #include "core/dom/Document.h"
 #include "core/dom/Element.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "wtf/Allocator.h"
 
 namespace blink {
 
-class Dictionary;
-
 class ElementAnimation {
   STATIC_ONLY(ElementAnimation);
 
  public:
   static Animation* animate(ExecutionContext* executionContext,
                             Element& element,
                             const DictionarySequenceOrDictionary& effectInput,
                             double duration,
                             ExceptionState& exceptionState) {
     EffectModel* effect = EffectInput::convert(
@@ skipping 62 matching lines @@
                                     const Timing& timing) {
     KeyframeEffect* keyframeEffect =
         KeyframeEffect::create(&element, effect, timing);
     return element.document().timeline().play(keyframeEffect);
   }
 };
 
 }  // namespace blink
 
 #endif  // ElementAnimation_h