Apply script preprocessor to Web page scripts only.

Source/bindings/v8/PageScriptDebugServer.cpp

 /*
  * Copyright (c) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 148 matching lines @@
     RefPtr<Frame> protect = frame;
     ScriptDebugServer::runScript(state, scriptId, result, wasThrown, exceptionMessage);
 
     if (frame)
         InspectorInstrumentation::didEvaluateScript(cookie);
 }
 
 ScriptDebugListener* PageScriptDebugServer::getDebugListenerForContext(v8::Handle<v8::Context> context)
 {
     v8::HandleScope scope;
+
+    // System-created contexts will crash retrieveFrameWithGlobalCheck
+    if (V8PerContextDebugData::contextDebugId(context) < 0)
+        return 0;
+
     Frame* frame = retrieveFrameWithGlobalObjectCheck(context);
     if (!frame)
         return 0;
     return m_listenersMap.get(frame->page());
 }
 
 void PageScriptDebugServer::runMessageLoopOnPause(v8::Handle<v8::Context> context)
 {
     v8::HandleScope scope;
     Frame* frame = retrieveFrameWithGlobalObjectCheck(context);
     m_pausedPage = frame->page();
 
     // Wait for continue or step command.
     m_clientMessageLoop->run(m_pausedPage);
 
     // The listener may have been removed in the nested loop.
     if (ScriptDebugListener* listener = m_listenersMap.get(m_pausedPage))
         listener->didContinue();
      
     m_pausedPage = 0;
 }
 
 void PageScriptDebugServer::quitMessageLoopOnPause()
 {
     m_clientMessageLoop->quitNow();
 }
 
 } // namespace WebCore