ash: Use mojo LocaleNotificationController interface.

ash/common/system/locale/locale_notification_controller.h

 // Copyright 2013 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 ASH_COMMON_SYSTEM_LOCALE_LOCALE_NOTIFICATION_CONTROLLER_H_
 #define ASH_COMMON_SYSTEM_LOCALE_LOCALE_NOTIFICATION_CONTROLLER_H_
 
 #include <string>
 
-#include "ash/common/system/locale/locale_observer.h"
+#include "ash/public/interfaces/locale.mojom.h"
 #include "base/macros.h"
+#include "mojo/public/cpp/bindings/binding_set.h"
 
 namespace ash {
 
 // Observes the locale change and creates rich notification for the change.
-class LocaleNotificationController : public LocaleObserver {
+class LocaleNotificationController
+    : public mojom::LocaleNotificationController {
  public:
   LocaleNotificationController();
   ~LocaleNotificationController() override;
 
+  void BindRequest(mojom::LocaleNotificationControllerRequest request);

[msw, 2016/10/14 01:46:29]

nit: comment (copy from ShelfController or similar):
// Binds the mojom::LocaleNotificationController interface request to this
object.

+
  private:
-  // Overridden from LocaleObserver.
-  void OnLocaleChanged(LocaleObserver::Delegate* delegate,
-                       const std::string& cur_locale,
-                       const std::string& from_locale,
-                       const std::string& to_locale) override;
+  // Overridden from mojom::LocaleNotificationController:
+  void NotifyLocaleChanged(

[msw, 2016/10/14 01:46:29]

Keep the name as OnLocaleChanged (it's a handler that does something on a locale
change, not a function that notifies observers of locale changes).

+      const std::string& cur_locale,
+      const std::string& from_locale,
+      const std::string& to_locale,
+      const NotifyLocaleChangedCallback& callback) override;
 
   std::string cur_locale_;
   std::string from_locale_;
   std::string to_locale_;
 
+  // Bindings for the LocaleNotificationController interface.
+  mojo::BindingSet<mojom::LocaleNotificationController> bindings_;
+
   DISALLOW_COPY_AND_ASSIGN(LocaleNotificationController);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SYSTEM_LOCALE_LOCALE_NOTIFICATION_CONTROLLER_H_