[Extensions] Fix chrome url override settings

chrome/browser/extensions/extension_web_ui_override_registrar.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_EXTENSION_WEB_UI_OVERRIDE_REGISTRAR_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_WEB_UI_OVERRIDE_REGISTRAR_H_
 
 #include "base/basictypes.h"
+#include "base/memory/weak_ptr.h"
 #include "base/scoped_observer.h"
 #include "extensions/browser/browser_context_keyed_api_factory.h"
 #include "extensions/browser/extension_registry_observer.h"
 
 namespace content {
 class BrowserContext;
 }
 
 namespace extensions {
 class ExtensionRegistry;
@@ skipping 10 matching lines @@
 
  private:
   friend class BrowserContextKeyedAPIFactory<ExtensionWebUIOverrideRegistrar>;
 
   // ExtensionRegistryObserver implementation.
   void OnExtensionLoaded(content::BrowserContext* browser_context,
                          const Extension* extension) override;
   void OnExtensionUnloaded(content::BrowserContext* browser_context,
                            const Extension* extension,
                            UnloadedExtensionInfo::Reason reason) override;
+  void OnExtensionUninstalled(content::BrowserContext* browser_context,
+                              const Extension* extension,
+                              UninstallReason reason) override;
+
+  void OnExtensionSystemReady(content::BrowserContext* context);
 
   // BrowserContextKeyedAPI implementation.
   static const char* service_name() {
     return "ExtensionWebUIOverrideRegistrar";
   }
 
   // Listen to extension load, unloaded notifications.
   ScopedObserver<ExtensionRegistry, ExtensionRegistryObserver>
       extension_registry_observer_;
 
+  base::WeakPtrFactory<ExtensionWebUIOverrideRegistrar> weak_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(ExtensionWebUIOverrideRegistrar);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_WEB_UI_OVERRIDE_REGISTRAR_H_