GuestView: Fix message routing across embedder navigations

content/browser/web_contents/web_contents_impl.cc

Index: content/browser/web_contents/web_contents_impl.cc
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index d2215b13cec355ba1f4de2eea91e71129366ebb7..7f216b5bde2491953f2f95954dc0e8236d0badb9 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -1874,7 +1874,7 @@ RenderFrameHost* WebContentsImpl::GetGuestByInstanceID(
   BrowserPluginGuestManager* guest_manager =
       GetBrowserContext()->GetGuestManager();
   WebContents* guest = guest_manager->GetGuestByInstanceID(
-      this, browser_plugin_instance_id);
+      GetRenderProcessHost()->GetID(), browser_plugin_instance_id);
   if (!guest)
     return NULL;
   return guest->GetMainFrame();