Extract minimal RenderViewHost interface for embedders, leaving

chrome/browser/sessions/restore_tab_helper.cc

Index: chrome/browser/sessions/restore_tab_helper.cc
diff --git a/chrome/browser/sessions/restore_tab_helper.cc b/chrome/browser/sessions/restore_tab_helper.cc
index 42c65f76a778d8c8b9893da688b59d0e8ee83af2..c9ef56e5c51fec1b5620cffc907e850cd1168d1c 100644
--- a/chrome/browser/sessions/restore_tab_helper.cc
+++ b/chrome/browser/sessions/restore_tab_helper.cc
@@ -37,11 +37,11 @@ void RestoreTabHelper::SetWindowID(const SessionID& id) {
   // Notify it that the window ID changed.
   web_contents()->GetRenderViewHost()->Send(
           new ExtensionMsg_UpdateBrowserWindowId(
-          web_contents()->GetRenderViewHost()->routing_id(), id.id()));
+          web_contents()->GetRenderViewHost()->GetRoutingID(), id.id()));
 }
 
 void RestoreTabHelper::RenderViewCreated(RenderViewHost* render_view_host) {
   render_view_host->Send(
-      new ExtensionMsg_UpdateBrowserWindowId(render_view_host->routing_id(),
+      new ExtensionMsg_UpdateBrowserWindowId(render_view_host->GetRoutingID(),
                                              window_id_.id()));
 }