Do not create proxy hosts in the subtree of navigating frame.

content/browser/frame_host/frame_tree.h

Index: content/browser/frame_host/frame_tree.h
diff --git a/content/browser/frame_host/frame_tree.h b/content/browser/frame_host/frame_tree.h
index bd1f19aa25b879c45213ec4de77fc2e0abd65c45..79c679092aae60d834a22b13de6357a7d2a996b6 100644
--- a/content/browser/frame_host/frame_tree.h
+++ b/content/browser/frame_host/frame_tree.h
@@ -135,6 +135,11 @@ class CONTENT_EXPORT FrameTree {
   typedef base::hash_map<int, RenderViewHostImpl*> RenderViewHostMap;
   typedef std::multimap<int, RenderViewHostImpl*> RenderViewHostMultiMap;
 
+  // A variation to the public ForEach method with a difference that the subtree
+  // starting at |skip_node| will not be recursed into.

[Charlie Reis, 2014/09/10 07:39:09]

nit: |skip_this_subtree|

[nasko, 2014/09/10 19:36:34]

Done.

+  void ForEach(const base::Callback<bool(FrameTreeNode*)>& on_node,
+               FrameTreeNode* skip_this_subtree) const;
+
   // These delegates are installed into all the RenderViewHosts and
   // RenderFrameHosts that we create.
   RenderFrameHostDelegate* render_frame_delegate_;