Fix message routing for BrowserPlugin in iframe

extensions/browser/guest_view/guest_view_base.cc

Index: extensions/browser/guest_view/guest_view_base.cc
diff --git a/extensions/browser/guest_view/guest_view_base.cc b/extensions/browser/guest_view/guest_view_base.cc
index f5cd21a6cdbfe0cc34b474c82eba283337d37db3..717a8ca5af60839e833dd29b677a305de68d0778 100644
--- a/extensions/browser/guest_view/guest_view_base.cc
+++ b/extensions/browser/guest_view/guest_view_base.cc
@@ -322,7 +322,6 @@ void GuestViewBase::DidAttach(int guest_proxy_routing_id) {
 
   // Inform the associated GuestViewContainer that the contentWindow is ready.
   embedder_web_contents()->Send(new ExtensionMsg_GuestAttached(
-      embedder_web_contents()->GetMainFrame()->GetRoutingID(),
       element_instance_id_,
       guest_proxy_routing_id));
 
@@ -333,7 +332,6 @@ void GuestViewBase::DidDetach() {
   GuestViewManager::FromBrowserContext(browser_context_)->DetachGuest(
       this, element_instance_id_);
   owner_web_contents()->Send(new ExtensionMsg_GuestDetached(
-      owner_web_contents()->GetMainFrame()->GetRoutingID(),
       element_instance_id_));
   element_instance_id_ = guestview::kInstanceIDNone;
 }