Merge 129350 - Web Inspector:EXC_BAD_ACCESS upon closing page with node highlighted

Source/WebCore/inspector/InspectorOverlay.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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 253 matching lines @@
 }
 
 void InspectorOverlay::update()
 {
     if (!m_highlightNode && !m_highlightRect && m_pausedInDebuggerMessage.isNull()) {
         m_client->hideHighlight();
         return;
     }
 
     FrameView* view = m_page->mainFrame()->view();
+    if (!view)
+        return;
+
     FrameView* overlayView = overlayPage()->mainFrame()->view();
     IntRect visibleRect = enclosingIntRect(view->visibleContentRect());
     overlayView->resize(visibleRect.width(), visibleRect.height());
 
     // Clear canvas and paint things.
     reset();
 
     drawNodeHighlight();
     drawRectHighlight();
     drawPausedInDebuggerMessage();
@@ skipping 175 matching lines @@
 {
     RefPtr<InspectorArray> command = InspectorArray::create();
     command->pushString(method);
     command->pushValue(argument);
     overlayPage()->mainFrame()->script()->evaluate(ScriptSourceCode(makeString("dispatch(", command->toJSONString(), ")")));
 }
 
 } // namespace WebCore
 
 #endif // ENABLE(INSPECTOR)