Issue AboutToNavigateRenderFrame notification after beforeunload handling.

content/browser/frame_host/render_frame_host_manager.cc

 // 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.
 
 #include "content/browser/frame_host/render_frame_host_manager.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "base/command_line.h"
@@ skipping 538 matching lines @@
       return;
 
     if (proceed) {
       // Ok to unload the current page, so proceed with the cross-process
       // navigation.  Note that if navigations are not currently suspended, it
       // might be because the renderer was deemed unresponsive and this call was
       // already made by ShouldCloseTabOnUnresponsiveRenderer.  In that case, it
       // is ok to do nothing here.
       if (pending_render_frame_host_ &&
           pending_render_frame_host_->are_navigations_suspended()) {
+        NavigatorDelegate* navigator_delegate =
+            frame_tree_node_->navigator()->GetDelegate();
+        if (navigator_delegate) {
+          navigator_delegate->AboutToNavigateRenderFrame(
+              render_frame_host_.get(), pending_render_frame_host_.get());
+        }
         pending_render_frame_host_->SetNavigationsSuspended(false,
                                                             proceed_time);
       }
     } else {
       // Current page says to cancel.
       CancelPending();
     }
   } else {
     // Non-cross-process transition means closing the entire tab.
     bool proceed_to_fire_unload;
@@ skipping 2025 matching lines @@
 int RenderFrameHostManager::GetOpenerRoutingID(SiteInstance* instance) {
   if (!frame_tree_node_->opener())
     return MSG_ROUTING_NONE;
 
   return frame_tree_node_->opener()
       ->render_manager()
       ->GetRoutingIdForSiteInstance(instance);
 }
 
 }  // namespace content