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

Source/bindings/core/v8/V8ScriptRunnerTest.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 "bindings/core/v8/V8ScriptRunner.h"
 
 #include "bindings/core/v8/V8Binding.h"
+#include "bindings/core/v8/V8TestingScope.h"
 #include "core/fetch/CachedMetadataHandler.h"
 #include "core/fetch/ScriptResource.h"
 #include "platform/heap/Handle.h"
 #include <gtest/gtest.h>
 #include <v8.h>
 
 namespace blink {
 
 namespace {
 
@@ skipping 132 matching lines @@
 {
     setResource();
     EXPECT_TRUE(compileScript(V8CacheOptionsCodeCompressed));
     EXPECT_FALSE(cacheHandler()->cachedMetadata(tagForParserCache(cacheHandler())));
     EXPECT_FALSE(cacheHandler()->cachedMetadata(tagForCodeCache(cacheHandler())));
 }
 
 } // namespace
 
 } // namespace blink