Add a FrameHostMsg_BeginNavigation IPC

content/browser/frame_host/navigator.h

Index: content/browser/frame_host/navigator.h
diff --git a/content/browser/frame_host/navigator.h b/content/browser/frame_host/navigator.h
index 595329d417dbe18c0b3791c5252055352cccf65b..70c2accf593fedf04bc008b9986f18d38c0b7ca1 100644
--- a/content/browser/frame_host/navigator.h
+++ b/content/browser/frame_host/navigator.h
@@ -37,7 +37,6 @@ class CONTENT_EXPORT Navigator : public base::RefCounted<Navigator> {
   // Returns the NavigationController associated with this Navigator.
   virtual NavigationController* GetController();
 
-
   // Notifications coming from the RenderFrameHosts ----------------------------
 
   // The RenderFrameHostImpl started a provisional load.
@@ -118,6 +117,12 @@ class CONTENT_EXPORT Navigator : public base::RefCounted<Navigator> {
       bool should_replace_current_entry,
       bool user_gesture) {}
 
+  // Will crash the browser if |render_frame_host| is a Web-UI renderer that
+  // tries to display a non Web UI |url|.
+  virtual void CheckWebUIRendererDoesNotDisplayNormalURL(
+      RenderFrameHostImpl* render_frame_host,
+      const GURL& url) {}
+
  protected:
   friend class base::RefCounted<Navigator>;
   virtual ~Navigator() {}