Web Animations: Remove confusing interpolation subdirectory.

Source/core/animation/AnimationStack.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 14 matching lines @@
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "core/animation/AnimationStack.h"
 
 #include "core/animation/CompositorAnimations.h"
+#include "core/animation/StyleInterpolation.h"
 #include "core/animation/css/CSSAnimations.h"
-#include "core/animation/interpolation/StyleInterpolation.h"
 #include "wtf/BitArray.h"
 #include "wtf/NonCopyingSort.h"
 #include <algorithm>
 
 namespace blink {
 
 namespace {
 
 void copyToActiveInterpolationMap(const WillBeHeapVector<RefPtrWillBeMember<blink::Interpolation> >& source, WillBeHeapHashMap<CSSPropertyID, RefPtrWillBeMember<blink::Interpolation> >& target)
 {
@@ skipping 118 matching lines @@
             FloatBox expandingBox(originalBox);
             if (!CompositorAnimations::instance()->getAnimatedBoundingBox(expandingBox, *anim->effect(), startRange, endRange))
                 return false;
             box.expandTo(expandingBox);
         }
     }
     return true;
 }
 
 } // namespace blink