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

Source/core/animation/EffectInputTest.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/EffectInput.h"
 
 #include "bindings/core/v8/Dictionary.h"
+#include "bindings/core/v8/V8TestingScope.h"
 #include "core/animation/AnimationTestHelper.h"
 #include "core/animation/KeyframeEffectModel.h"
 #include "core/dom/Document.h"
 #include "core/dom/Element.h"
 #include "core/dom/ExceptionCode.h"
 #include <gtest/gtest.h>
 #include <v8.h>
 
 using namespace blink;
 
@@ skipping 122 matching lines @@
     jsKeyframes.append(Dictionary(keyframe1, m_isolate, exceptionState));
     jsKeyframes.append(Dictionary(keyframe2, m_isolate, exceptionState));
     jsKeyframes.append(Dictionary(keyframe3, m_isolate, exceptionState));
 
     EffectInput::convert(element.get(), jsKeyframes, exceptionState);
     EXPECT_TRUE(exceptionState.hadException());
     EXPECT_EQ(InvalidModificationError, exceptionState.code());
 }
 
 }