Make classes and structures in Source/core/animation fast-allocated.

Source/core/animation/AnimationInputHelpers.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 AnimationInputHelpers_h
 #define AnimationInputHelpers_h
 
 #include "core/CSSPropertyNames.h"
 #include "core/CoreExport.h"
 #include "wtf/Forward.h"
 
 namespace blink {
 
 class TimingFunction;
 
 class CORE_EXPORT AnimationInputHelpers {
+    STATIC_ONLY(AnimationInputHelpers);
 public:
     static CSSPropertyID keyframeAttributeToCSSPropertyID(const String&);
     static PassRefPtr<TimingFunction> parseTimingFunction(const String&);
 };
 
 } // namespace blink
 
 #endif // AnimationInputHelpers_h