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..904193b4f2a3aebe8598028b645578e88cf5c0f9 100644
--- a/content/browser/frame_host/frame_tree.h
+++ b/content/browser/frame_host/frame_tree.h
@@ -69,6 +69,11 @@ class CONTENT_EXPORT FrameTree {
   // it safe to remove children during the callback.
   void ForEach(const base::Callback<bool(FrameTreeNode*)>& on_node) const;
 
+  // A variation to the method above with a difference that the subtree starting
+  // at |skip_node| will not be recursed into.
+  void ForEach(const base::Callback<bool(FrameTreeNode*)>& on_node,

[awong, 2014/09/03 21:58:38]

Does this need to be public?

[nasko, 2014/09/03 23:50:19]

No.

+               FrameTreeNode* skip_node) const;

[awong, 2014/09/03 21:58:38]

skip_node -> skip_this_subtree?

[nasko, 2014/09/03 23:50:19]

Done.

+
   // Frame tree manipulation routines.
   RenderFrameHostImpl* AddFrame(FrameTreeNode* parent,
                                 int new_routing_id,