Remove WebContentsObserver::ProvisionalChangeToMainFrameUrl and all the code supporting it.

content/browser/frame_host/navigator.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_FRAME_HOST_NAVIGATOR_H_
 #define CONTENT_BROWSER_FRAME_HOST_NAVIGATOR_H_
 
 #include "base/memory/ref_counted.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/navigation_controller.h"
@@ skipping 40 matching lines @@
       RenderFrameHostImpl* render_frame_host,
       const FrameHostMsg_DidFailProvisionalLoadWithError_Params& params) {};
 
   // The RenderFrameHostImpl has failed to load the document.
   virtual void DidFailLoadWithError(
       RenderFrameHostImpl* render_frame_host,
       const GURL& url,
       int error_code,
       const base::string16& error_description) {}
 
-  // The RenderFrameHostImpl processed a redirect during a provisional load.
-  //
-  // TODO(creis): Remove this method and have the pre-rendering code listen to
-  // WebContentsObserver::DidGetRedirectForResourceRequest instead.
-  // See http://crbug.com/78512.
-  virtual void DidRedirectProvisionalLoad(
-      RenderFrameHostImpl* render_frame_host,
-      int32 page_id,
-      const GURL& source_url,
-      const GURL& target_url) {}
-
   // The RenderFrameHostImpl has committed a navigation.
   virtual void DidNavigate(
       RenderFrameHostImpl* render_frame_host,
       const FrameHostMsg_DidCommitProvisionalLoad_Params& params) {}
 
   // Called by the NavigationController to cause the Navigator to navigate
   // to the current pending entry. The NavigationController should be called
   // back with RendererDidNavigate on success or DiscardPendingEntry on failure.
   // The callbacks can be inside of this function, or at some future time.
   //
@@ skipping 45 matching lines @@
                                 const NavigationBeforeCommitInfo& info) {};
 
  protected:
   friend class base::RefCounted<Navigator>;
   virtual ~Navigator() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_NAVIGATOR_H_