Remove the ability of webpages to specify strings for the onbeforeunload dialog.

third_party/WebKit/Source/web/ChromeClientImpl.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  *
  * 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.
@@ skipping 381 matching lines @@
             lineNumber,
             stackTrace);
     }
 }
 
 bool ChromeClientImpl::canOpenBeforeUnloadConfirmPanel()
 {
     return !!m_webView->client();
 }
 
-bool ChromeClientImpl::openBeforeUnloadConfirmPanelDelegate(LocalFrame* frame, const String& message, bool isReload)
+bool ChromeClientImpl::openBeforeUnloadConfirmPanelDelegate(LocalFrame* frame, bool isReload)
 {
     notifyPopupOpeningObservers();
     WebLocalFrameImpl* webframe = WebLocalFrameImpl::fromFrame(frame);
-    return webframe->client() && webframe->client()->runModalBeforeUnloadDialog(isReload, message);
+    return webframe->client() && webframe->client()->runModalBeforeUnloadDialog(isReload);
 }
 
 void ChromeClientImpl::closeWindowSoon()
 {
     // Make sure this Page can no longer be found by JS.
     m_webView->page()->willBeClosed();
 
     // Make sure that all loading is stopped.  Ensures that JS stops executing!
     m_webView->mainFrame()->stopLoading();
 
@@ skipping 641 matching lines @@
     if (m_webView->pageImportanceSignals())
         m_webView->pageImportanceSignals()->setIssuedNonGetFetchFromScript();
 }
 
 PassOwnPtr<WebFrameScheduler> ChromeClientImpl::createFrameScheduler()
 {
     return m_webView->scheduler()->createFrameScheduler().release();
 }
 
 } // namespace blink