Convert MobileSetupUI to use the new navigation callbacks.

chrome/browser/ui/webui/chromeos/mobile_setup_ui.h

Index: chrome/browser/ui/webui/chromeos/mobile_setup_ui.h
diff --git a/chrome/browser/ui/webui/chromeos/mobile_setup_ui.h b/chrome/browser/ui/webui/chromeos/mobile_setup_ui.h
index 048cf794eaddac4d2f26464887f6bbdb2b4aa403..0fd9d74190e39ac01d0e69cec91fb2f0344248e1 100644
--- a/chrome/browser/ui/webui/chromeos/mobile_setup_ui.h
+++ b/chrome/browser/ui/webui/chromeos/mobile_setup_ui.h
@@ -20,15 +20,8 @@ class MobileSetupUI : public content::WebUIController,
 
  private:
   // content::WebContentsObserver overrides.
-  void DidCommitProvisionalLoadForFrame(
-      content::RenderFrameHost* render_frame_host,
-      const GURL& url,
-      ui::PageTransition transition_type) override;
-  void DidFailProvisionalLoad(content::RenderFrameHost* render_frame_host,
-                              const GURL& validated_url,
-                              int error_code,
-                              const base::string16& error_description,
-                              bool was_ignored_by_handler) override;
+  void DidFinishNavigation(
+      content::NavigationHandle* navigation_handle) override;
 
   DISALLOW_COPY_AND_ASSIGN(MobileSetupUI);
 };