Ensure that before creating proxy of site A, RVH of site A is initialized.

content/browser/frame_host/render_frame_host_impl.cc

Index: content/browser/frame_host/render_frame_host_impl.cc
diff --git a/content/browser/frame_host/render_frame_host_impl.cc b/content/browser/frame_host/render_frame_host_impl.cc
index f284e5765ae46ad8fe3d6ec78e6a8c38ec56c3af..51301fc12012783e0fc1ab0fd460c44caebc6149 100644
--- a/content/browser/frame_host/render_frame_host_impl.cc
+++ b/content/browser/frame_host/render_frame_host_impl.cc
@@ -517,6 +517,14 @@ bool RenderFrameHostImpl::CreateRenderFrame(int parent_routing_id,
   Send(new FrameMsg_NewFrame(routing_id_, parent_routing_id, proxy_routing_id,
                              frame_tree_node()->current_replication_state()));
 
+  if (proxy_routing_id != MSG_ROUTING_NONE) {
+    RenderFrameProxyHost* proxy = RenderFrameProxyHost::FromID(
+        GetProcess()->GetID(), proxy_routing_id);
+    // We have also created a RenderFrameProxy in FrameMsg_NewFrame above, so
+    // remember that.
+    proxy->set_render_frame_proxy_created(true);
+  }
+
   // The renderer now has a RenderFrame for this RenderFrameHost.  Note that
   // this path is only used for out-of-process iframes.  Main frame RenderFrames
   // are created with their RenderView, and same-site iframes are created at the