Remove AboutToNavigateRenderFrame, issue custom notification for DevTools.

content/browser/frame_host/navigator_delegate.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_DELEGATE_H_
 #define CONTENT_BROWSER_FRAME_HOST_NAVIGATOR_DELEGATE_H_
 
 #include "base/strings/string16.h"
 #include "content/public/browser/invalidate_type.h"
 #include "content/public/browser/navigation_controller.h"
@@ skipping 79 matching lines @@
       const FrameHostMsg_DidCommitProvisionalLoad_Params& params) {}
 
   virtual void SetMainFrameMimeType(const std::string& mime_type) {}
   virtual bool CanOverscrollContent() const;
 
   // Notification to the Navigator embedder that navigation state has
   // changed. This method corresponds to
   // WebContents::NotifyNavigationStateChanged.
   virtual void NotifyChangedNavigationState(InvalidateTypes changed_flags) {}
 
-  // Notifies the Navigator embedder that it is beginning to navigate a frame.
-  virtual void AboutToNavigateRenderFrame(
-      RenderFrameHostImpl* old_host,
-      RenderFrameHostImpl* new_host) {}
-
   // Notifies the Navigator embedder that a navigation to the pending
   // NavigationEntry has started in the browser process.
   virtual void DidStartNavigationToPendingEntry(
       const GURL& url,
       NavigationController::ReloadType reload_type) {}
 
   // Opens a URL with the given parameters. See PageNavigator::OpenURL, which
   // this forwards to.
   virtual void RequestOpenURL(RenderFrameHostImpl* render_frame_host,
                               const OpenURLParams& params) {}
@@ skipping 13 matching lines @@
   // throbber stopping.
   virtual void DidStopLoading() {}
 
   // The load progress was changed.
   virtual void DidChangeLoadProgress() {}
 };
 
 }  // namspace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_NAVIGATOR_DELEGATE_H_