[bindings] Migrate V8TestingScope out of V8Binding.h/cpp

Source/core/animation/AnimationTest.cpp

 // 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.
 
 #include "config.h"
 #include "core/animation/Animation.h"
 
 #include "bindings/core/v8/Dictionary.h"
 #include "bindings/core/v8/UnionTypesCore.h"
 #include "bindings/core/v8/V8AnimationTimingProperties.h"
+#include "bindings/core/v8/V8TestingScope.h"
 #include "core/animation/AnimationClock.h"
 #include "core/animation/AnimationNodeTiming.h"
 #include "core/animation/AnimationTestHelper.h"
 #include "core/animation/AnimationTimeline.h"
 #include "core/animation/KeyframeEffectModel.h"
 #include "core/animation/Timing.h"
 #include "core/dom/Document.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/testing/DummyPageHolder.h"
 #include <gtest/gtest.h>
@@ skipping 433 matching lines @@
     EXPECT_EQ(element.get(), animation->target());
     document.timeline().play(animation.get());
     pageHolder.clear();
     element.clear();
 #if !ENABLE(OILPAN)
     EXPECT_EQ(0, animation->target());
 #endif
 }
 
 } // namespace blink