Provide default implementations for NotificationDelegate methods.

chrome/browser/chromeos/file_system_provider/notification_manager.cc

 // Copyright 2014 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.
 
 #include "chrome/browser/chromeos/file_system_provider/notification_manager.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/extensions/app_icon_loader_impl.h"
 #include "chrome/grit/generated_resources.h"
@@ skipping 18 matching lines @@
   // Passing a raw pointer is safe here, since the life of each notification is
   // shorter than life of the |notification_manager|.
   explicit ProviderNotificationDelegate(
       NotificationManager* notification_manager)
       : notification_manager_(notification_manager) {}
 
   virtual void ButtonClick(int button_index) override {
     notification_manager_->OnButtonClick(button_index);
   }
 
-  virtual void Display() override {}
-
   virtual void Error() override { notification_manager_->OnError(); }
 
   virtual void Close(bool by_user) override {
     notification_manager_->OnClose();
   }
 
-  virtual void Click() override {}
-
  private:
   virtual ~ProviderNotificationDelegate() {}
   NotificationManager* notification_manager_;  // Not owned.
 
   DISALLOW_COPY_AND_ASSIGN(ProviderNotificationDelegate);
 };
 
 }  // namespace
 
 NotificationManager::NotificationManager(
@@ skipping 93 matching lines @@
   while (it != callbacks_.end()) {
     CallbackMap::iterator current_it = it++;
     NotificationCallback callback = current_it->second;
     callbacks_.erase(current_it);
     callback.Run(result);
   }
 }
 
 }  // namespace file_system_provider
 }  // namespace chromeos