Fix Runtime.executionContextCreated for crafted iframes.

Source/core/inspector/InspectorPageAgent.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 964 matching lines @@
     Settings* settings = mainFrame()->settings();
     if (settings) {
         m_ignoreScriptsEnabledNotification = true;
         settings->setScriptEnabled(!value);
         m_ignoreScriptsEnabledNotification = false;
     }
 }
 
 void InspectorPageAgent::didClearDocumentOfWindowObject(LocalFrame* frame)
 {
-    if (frame == m_page->mainFrame())
-        m_injectedScriptManager->discardInjectedScripts();
-
     if (!m_frontend)
         return;
 
     RefPtr<JSONObject> scripts = m_state->getObject(PageAgentState::pageAgentScriptsToEvaluateOnLoad);
     if (scripts) {
         JSONObject::const_iterator end = scripts->end();
         for (JSONObject::const_iterator it = scripts->begin(); it != end; ++it) {
             String scriptText;
             if (it->value->asString(&scriptText))
                 frame->script().executeScriptInMainWorld(scriptText);
@@ skipping 498 matching lines @@
 void InspectorPageAgent::trace(Visitor* visitor)
 {
     visitor->trace(m_page);
     visitor->trace(m_injectedScriptManager);
     visitor->trace(m_inspectorResourceContentLoader);
     InspectorBaseAgent::trace(visitor);
 }
 
 } // namespace blink