Resetting FrameTreeNode must remove child FrameTreeNodes from global map.

content/browser/frame_host/frame_tree.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/frame_tree.h"
 
 #include <queue>
 
 #include "base/bind.h"
 #include "base/callback.h"
@@ skipping 164 matching lines @@
 
   // Notify observers of the frame removal.
   RenderFrameHostImpl* render_frame_host = child->current_frame_host();
   if (!on_frame_removed_.is_null()) {
     on_frame_removed_.Run(render_frame_host);
   }
   g_frame_tree_node_id_map.Get().erase(child->frame_tree_node_id());
   parent->RemoveChild(child);
 }
 
+void FrameTree::RemoveNodeFromMap(int64 frame_tree_node_id) {
+  g_frame_tree_node_id_map.Get().erase(frame_tree_node_id);
+}
+
 void FrameTree::CreateProxiesForSiteInstance(
     FrameTreeNode* source,
     SiteInstance* site_instance) {
   // Create the swapped out RVH for the new SiteInstance. This will create
   // a top-level swapped out RFH as well, which will then be wrapped by a
   // RenderFrameProxyHost.
   if (!source->IsMainFrame()) {
     RenderViewHostImpl* render_view_host =
         source->frame_tree()->GetRenderViewHost(site_instance);
     if (!render_view_host) {
@@ skipping 130 matching lines @@
         rvh->Shutdown();
         render_view_host_pending_shutdown_map_.erase(multi_iter);
       }
       break;
     }
     CHECK(render_view_host_found);
   }
 }
 
 }  // namespace content