Add a scoping object to help block scripting during plugin destruction.

Source/web/WebPluginScriptForbiddenScope.cpp

 // Copyright 2015 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 "modules/webaudio/testing/InternalsWebAudio.h"
+#include "public/web/WebPluginScriptForbiddenScope.h"
 
-#include "modules/webaudio/AudioNode.h"
+#include "platform/PluginScriptForbiddenScope.h"
 
 namespace blink {
 
-unsigned InternalsWebAudio::audioHandlerCount(Internals& internals)
+bool WebPluginScriptForbiddenScope::isForbidden()
 {
-    return AudioHandler::instanceCount();
+    return PluginScriptForbiddenScope::isForbidden();
 }
 
 } // namespace blink