Web Animations: Remove confusing interpolation subdirectory.

Source/core/animation/interpolation/LengthStyleInterpolation.h

Index: Source/core/animation/interpolation/LengthStyleInterpolation.h
diff --git a/Source/core/animation/interpolation/LengthStyleInterpolation.h b/Source/core/animation/interpolation/LengthStyleInterpolation.h
deleted file mode 100644
index 81d60661bf64eccef1b518437d0ec148e9f6f5db..0000000000000000000000000000000000000000
--- a/Source/core/animation/interpolation/LengthStyleInterpolation.h
+++ /dev/null
@@ -1,42 +0,0 @@
-// 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 LengthStyleInterpolation_h
-#define LengthStyleInterpolation_h
-
-#include "core/animation/interpolation/StyleInterpolation.h"
-#include "platform/Length.h"
-
-namespace blink {
-
-class LengthStyleInterpolation : public StyleInterpolation {
-public:
-    static PassRefPtrWillBeRawPtr<LengthStyleInterpolation> create(CSSValue* start, CSSValue* end, CSSPropertyID id,  ValueRange range)
-    {
-        return adoptRefWillBeNoop(new LengthStyleInterpolation(lengthToInterpolableValue(start), lengthToInterpolableValue(end), id, range));
-    }
-
-    static bool canCreateFrom(const CSSValue&);
-
-    virtual void apply(StyleResolverState&) const OVERRIDE;
-
-    virtual void trace(Visitor*) OVERRIDE;
-
-private:
-    LengthStyleInterpolation(PassOwnPtrWillBeRawPtr<InterpolableValue> start, PassOwnPtrWillBeRawPtr<InterpolableValue> end, CSSPropertyID id,  ValueRange range)
-        : StyleInterpolation(start, end, id)
-        , m_range(range)
-    { }
-
-    static PassOwnPtrWillBeRawPtr<InterpolableValue> lengthToInterpolableValue(CSSValue*);
-    static PassRefPtrWillBeRawPtr<CSSValue> interpolableValueToLength(InterpolableValue*, ValueRange);
-
-    ValueRange m_range;
-
-    friend class AnimationLengthStyleInterpolationTest;
-};
-
-}
-
-#endif