RenderFrame: flesh out Observer

chrome/browser/ui/alternate_error_tab_observer.cc

Index: chrome/browser/ui/alternate_error_tab_observer.cc
diff --git a/chrome/browser/ui/alternate_error_tab_observer.cc b/chrome/browser/ui/alternate_error_tab_observer.cc
index 21415ce20c1335758ac95f2215c0cf5619c6dabc..a7357281df50da1ffa6760c791f83321334ea537 100644
--- a/chrome/browser/ui/alternate_error_tab_observer.cc
+++ b/chrome/browser/ui/alternate_error_tab_observer.cc
@@ -12,9 +12,11 @@
 #include "chrome/common/render_messages.h"
 #include "components/user_prefs/pref_registry_syncable.h"
 #include "content/public/browser/notification_service.h"
+#include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/web_contents.h"
 
+using content::RenderFrameHost;
 using content::RenderViewHost;
 using content::WebContents;
 
@@ -93,6 +95,7 @@ void AlternateErrorPageTabObserver::OnAlternateErrorPagesEnabledChanged() {
 
 void AlternateErrorPageTabObserver::UpdateAlternateErrorPageURL(
     RenderViewHost* rvh) {
-  rvh->Send(new ChromeViewMsg_SetAltErrorPageURL(
-                rvh->GetRoutingID(), GetAlternateErrorPageURL()));
+  RenderFrameHost* rfh = rvh->GetMainFrame();
+  rfh->Send(new ChromeViewMsg_SetAltErrorPageURL(
+                rfh->GetRoutingID(), GetAlternateErrorPageURL()));
 }