Web Animations: Remove confusing interpolation subdirectory.

Source/core/animation/css/CSSAnimations.cpp

 /*
  * 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 18 matching lines @@
  */
 
 #include "config.h"
 #include "core/animation/css/CSSAnimations.h"
 
 #include "core/StylePropertyShorthand.h"
 #include "core/animation/ActiveAnimations.h"
 #include "core/animation/AnimationTimeline.h"
 #include "core/animation/CompositorAnimations.h"
 #include "core/animation/KeyframeEffectModel.h"
+#include "core/animation/LegacyStyleInterpolation.h"
 #include "core/animation/css/CSSAnimatableValueFactory.h"
 #include "core/animation/css/CSSPropertyEquality.h"
-#include "core/animation/interpolation/LegacyStyleInterpolation.h"
 #include "core/css/CSSKeyframeRule.h"
 #include "core/css/resolver/CSSToStyleMap.h"
 #include "core/css/resolver/StyleResolver.h"
 #include "core/dom/Element.h"
 #include "core/dom/PseudoElement.h"
 #include "core/events/TransitionEvent.h"
 #include "core/events/WebKitAnimationEvent.h"
 #include "core/frame/UseCounter.h"
 #include "core/rendering/RenderLayer.h"
 #include "core/rendering/RenderObject.h"
@@ skipping 787 matching lines @@
 #if ENABLE(OILPAN)
     visitor->trace(m_newTransitions);
     visitor->trace(m_activeInterpolationsForAnimations);
     visitor->trace(m_activeInterpolationsForTransitions);
     visitor->trace(m_newAnimations);
     visitor->trace(m_cancelledAnimationPlayers);
 #endif
 }
 
 } // namespace blink