Remove AboutToNavigateRenderFrame, issue custom notification for DevTools.

content/public/browser/web_contents_observer.h

 // Copyright (c) 2012 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_PUBLIC_BROWSER_WEB_CONTENTS_OBSERVER_H_
 #define CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_OBSERVER_H_
 
 #include "base/process/kill.h"
 #include "base/process/process_handle.h"
 #include "content/common/content_export.h"
@@ skipping 188 matching lines @@
   // This method is like DidFinishLoad, but when the load failed or was
   // cancelled, e.g. window.stop() is invoked.
   virtual void DidFailLoad(RenderFrameHost* render_frame_host,
                            const GURL& validated_url,
                            int error_code,
                            const base::string16& error_description,
                            bool was_ignored_by_handler) {}
 
   // ---------------------------------------------------------------------------
 
-  // This method is invoked after the WebContents decides which RenderFrameHost
-  // to use for the next browser-initiated navigation, but before the navigation
-  // starts.  It is not called for most renderer-initiated navigations, and it
-  // does not guarantee that the navigation will commit (e.g., 204s, downloads).
-  //
-  // DEPRECATED.  This method is difficult to use correctly and should be
-  // removed.  TODO(creis): Remove in http://crbug.com/424641.
-  virtual void AboutToNavigateRenderFrame(RenderFrameHost* old_host,
-                                          RenderFrameHost* new_host) {}
-
   // This method is invoked after the browser process starts a navigation to a
   // pending NavigationEntry. It is not called for renderer-initiated
   // navigations unless they are sent to the browser process via OpenURL. It may
   // be called multiple times for a given navigation, such as a typed URL
   // followed by a cross-process client or server redirect.
   virtual void DidStartNavigationToPendingEntry(
       const GURL& url,
       NavigationController::ReloadType reload_type) {}
 
   // |render_frame_host| is the RenderFrameHost for which the provisional load
@@ skipping 236 matching lines @@
   void ResetWebContents();
 
   WebContentsImpl* web_contents_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsObserver);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_OBSERVER_H_