Clean up forward declarations in Source/core

Source/core/inspector/InspectorAnimationAgent.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 InspectorAnimationAgent_h
 #define InspectorAnimationAgent_h
 
 #include "core/InspectorFrontend.h"
 #include "core/css/CSSKeyframesRule.h"
 #include "core/inspector/InspectorBaseAgent.h"
 #include "wtf/PassOwnPtr.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
-class Animation;
 class AnimationNode;
 class AnimationPlayer;
 class Element;
 class InspectorDOMAgent;
-class StringKeyframe;
 
 class InspectorAnimationAgent final : public InspectorBaseAgent<InspectorAnimationAgent>, public InspectorBackendDispatcher::AnimationCommandHandler {
     WTF_MAKE_NONCOPYABLE(InspectorAnimationAgent);
 public:
     static PassOwnPtrWillBeRawPtr<InspectorAnimationAgent> create(InspectorDOMAgent* domAgent)
     {
         return adoptPtrWillBeNoop(new InspectorAnimationAgent(domAgent));
     }
 
     // Base agent methods.
@@ skipping 21 matching lines @@
     PassRefPtr<TypeBuilder::Array<TypeBuilder::Animation::AnimationPlayer> > buildArrayForAnimationPlayers(Element&, const WillBeHeapVector<RefPtrWillBeMember<AnimationPlayer> >);
 
     RawPtrWillBeMember<InspectorDOMAgent> m_domAgent;
     InspectorFrontend::Animation* m_frontend;
     WillBeHeapHashMap<String, RefPtrWillBeMember<AnimationPlayer> > m_idToAnimationPlayer;
 };
 
 }
 
 #endif // InspectorAnimationAgent_h