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

Source/bindings/core/v8/ScriptStreamerTest.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/ScriptStreamer.h"
 
 #include "bindings/core/v8/ScriptSourceCode.h"
 #include "bindings/core/v8/ScriptStreamerThread.h"
 #include "bindings/core/v8/V8Binding.h"
 #include "bindings/core/v8/V8ScriptRunner.h"
+#include "bindings/core/v8/V8TestingScope.h"
 #include "core/dom/Element.h"
 #include "core/dom/PendingScript.h"
 #include "core/frame/Settings.h"
 #include "core/testing/UnitTestHelpers.h"
 #include "platform/Task.h"
 #include "platform/heap/Handle.h"
 #include "public/platform/Platform.h"
 
 #include <gtest/gtest.h>
 #include <v8.h>
@@ skipping 360 matching lines @@
     EXPECT_TRUE(sourceCode.streamer());
     v8::TryCatch tryCatch;
     v8::Handle<v8::Script> script = V8ScriptRunner::compileScript(sourceCode, isolate());
     EXPECT_FALSE(script.IsEmpty());
     EXPECT_FALSE(tryCatch.HasCaught());
 }
 
 } // namespace
 
 } // namespace blink