Create RenderFrameProxyHost at time of swap-out instead of commit.

content/renderer/render_view_impl_params.h

Index: content/renderer/render_view_impl_params.h
diff --git a/content/renderer/render_view_impl_params.h b/content/renderer/render_view_impl_params.h
index 4dcd75345f81932a45ba2dfc66c08a22d0714d73..5e17a4226326007297f9edf2b2e1aedc83b68ae5 100644
--- a/content/renderer/render_view_impl_params.h
+++ b/content/renderer/render_view_impl_params.h
@@ -29,6 +29,7 @@ struct CONTENT_EXPORT RenderViewImplParams {
                        const WebPreferences& webkit_prefs,
                        int32 routing_id,
                        int32 main_frame_routing_id,
+                       int32 proxy_routing_id,
                        int32 surface_id,
                        int64 session_storage_namespace_id,
                        const base::string16& frame_name,
@@ -47,6 +48,7 @@ struct CONTENT_EXPORT RenderViewImplParams {
   const WebPreferences& webkit_prefs;
   int32 routing_id;
   int32 main_frame_routing_id;
+  int32 proxy_routing_id;
   int32 surface_id;
   int64 session_storage_namespace_id;
   const base::string16& frame_name;