PlzNavigate: Invoke didStartProvisionalLoad() when the renderer initiates a navigation in startLoad(

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 326 matching lines @@
   virtual void willSendSubmitEvent(const WebFormElement&) {}
 
   // A form submission is about to occur.
   virtual void willSubmitForm(const WebFormElement&) {}
 
   // A datasource has been created for a new navigation.  The given
   // datasource will become the provisional datasource for the frame.
   virtual void didCreateDataSource(WebLocalFrame*, WebDataSource*) {}
 
   // A new provisional load has been started.
-  virtual void didStartProvisionalLoad(WebLocalFrame* localFrame) {}
+  virtual void didStartProvisionalLoad(WebDataSource* dataSource) {}
 
   // The provisional load was redirected via a HTTP 3xx response.
   virtual void didReceiveServerRedirectForProvisionalLoad(WebLocalFrame*) {}
 
   // The provisional load failed. The WebHistoryCommitType is the commit type
   // that would have been used had the load succeeded.
   virtual void didFailProvisionalLoad(WebLocalFrame*,
                                       const WebURLError&,
                                       WebHistoryCommitType) {}
 
@@ skipping 394 matching lines @@
   // Overwrites the given URL to use an HTML5 embed if possible.
   // An empty URL is returned if the URL is not overriden.
   virtual WebURL overrideFlashEmbedWithHTML(const WebURL& url) {
     return WebURL();
   }
 };
 
 }  // namespace blink
 
 #endif