Remove AboutToNavigateRenderFrame, issue custom notification for DevTools.

content/browser/web_contents/web_contents_impl.cc

 // 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.
 
 #include "content/browser/web_contents/web_contents_impl.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/lazy_instance.h"
@@ skipping 2850 matching lines @@
       observers_,
       DidFailLoad(render_frame_host, url, error_code, error_description,
         was_ignored_by_handler));
 }
 
 void WebContentsImpl::NotifyChangedNavigationState(
     InvalidateTypes changed_flags) {
   NotifyNavigationStateChanged(changed_flags);
 }
 
-void WebContentsImpl::AboutToNavigateRenderFrame(
-      RenderFrameHostImpl* old_host,
-      RenderFrameHostImpl* new_host) {
-  // Notify observers that we will navigate in this RenderFrame.
-  FOR_EACH_OBSERVER(
-      WebContentsObserver,
-      observers_,
-      AboutToNavigateRenderFrame(old_host, new_host));
-}
-
 void WebContentsImpl::DidStartNavigationToPendingEntry(
       const GURL& url,
       NavigationController::ReloadType reload_type) {
   // Notify observers about navigation.
   FOR_EACH_OBSERVER(
       WebContentsObserver,
       observers_,
       DidStartNavigationToPendingEntry(url, reload_type));
 }
 
@@ skipping 1759 matching lines @@
   return NULL;
 }
 
 void WebContentsImpl::SetForceDisableOverscrollContent(bool force_disable) {
   force_disable_overscroll_content_ = force_disable;
   if (view_)
     view_->SetOverscrollControllerEnabled(CanOverscrollContent());
 }
 
 }  // namespace content