Deal with frame removal by content scripts

third_party/WebKit/public/web/WebFrameClient.h

 /*
  * Copyright (C) 2011, 2012 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 279 matching lines @@
 
     // The frame's document has just been initialized.
     virtual void didCreateNewDocument(WebLocalFrame* frame) { }
 
     // The window object for the frame has been cleared of any extra
     // properties that may have been set by script from the previously
     // loaded document.
     virtual void didClearWindowObject(WebLocalFrame* frame) { }
 
     // The document element has been created.
+    // This method may not invalidate the frame, nor execute JavaScript code.
     virtual void didCreateDocumentElement(WebLocalFrame*) { }
 
+    // Like |didCreateDocumentElement|, except this method may run JavaScript
+    // code (and possibly invalidate the frame).
+    virtual void runScriptsAtDocumentElementAvailable(WebLocalFrame*) { }
+
     // The page title is available.
     virtual void didReceiveTitle(WebLocalFrame* frame, const WebString& title, WebTextDirection direction) { }
 
     // The icon for the page have changed.
     virtual void didChangeIcon(WebLocalFrame*, WebIconURL::Type) { }
 
     // The frame's document finished loading.
+    // This method may not execute JavaScript code.
     virtual void didFinishDocumentLoad(WebLocalFrame*, bool documentIsEmpty) { }
 
+    // Like |didFinishDocumentLoad|, except this method may run JavaScript
+    // code (and possibly invalidate the frame).
+    virtual void runScriptsAtDocumentReady(WebLocalFrame*) { }
+
     // The 'load' event was dispatched.
     virtual void didHandleOnloadEvents(WebLocalFrame*) { }
 
     // The frame's document or one of its subresources failed to load. The
     // WebHistoryCommitType is the commit type that would have been used had the
     // load succeeded.
     virtual void didFailLoad(WebLocalFrame*, const WebURLError&, WebHistoryCommitType) { }
 
     // The frame's document and all of its subresources succeeded to load.
     virtual void didFinishLoad(WebLocalFrame*) { }
@@ skipping 378 matching lines @@
     // This method takes ownership of the callbacks pointer.
     virtual void checkIfAudioSinkExistsAndIsAuthorized(const WebString& sinkId, const WebSecurityOrigin&, WebSetSinkIdCallbacks*) { BLINK_ASSERT_NOT_REACHED(); }
 
 protected:
     virtual ~WebFrameClient() { }
 };
 
 } // namespace blink
 
 #endif