Cleanup v8 usage in core

Source/core/testing/v8/WebCoreTestSupport.h

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
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 #ifndef WebCoreTestSupport_h
 #define WebCoreTestSupport_h
 
+// Normally we'd have:
+// #include <v8.h>
+// ...but this file is used in cases where we don't have V8 (e.g., Skia)
 namespace v8 {
 class Context;
 template <class T> class Local;
 }
 
 namespace WebCore {
 class LocalFrame;
 class PagePopupController;
 }
 
 namespace WebCoreTestSupport {
 
 void injectInternalsObject(v8::Local<v8::Context>);
 void resetInternalsObject(v8::Local<v8::Context>);
 
 } // namespace WebCore
 
 #endif