Remove unnecessary image downloading handler of notifications.

chrome/browser/ui/cocoa/apps/quit_with_apps_controller_mac.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/ui/cocoa/apps/quit_with_apps_controller_mac.h"
 
 #include "base/command_line.h"
 #include "base/i18n/number_formatting.h"
 #include "base/prefs/pref_registry_simple.h"
 #include "base/prefs/pref_service.h"
@@ skipping 77 matching lines @@
   g_browser_process->notification_ui_manager()->CancelById(
       id(), NotificationUIManager::GetProfileID(notification_profile_));
   if (button_index == kQuitAllAppsButtonIndex) {
     AppWindowRegistryUtil::CloseAllAppWindows();
   } else if (button_index == kDontShowAgainButtonIndex) {
     g_browser_process->local_state()->SetBoolean(
         prefs::kNotifyWhenAppsKeepChromeAlive, false);
   }
 }
 
-content::WebContents* QuitWithAppsController::GetWebContents() const {
-  return NULL;
-}
-
 std::string QuitWithAppsController::id() const {
   return kQuitWithAppsNotificationID;
 }
 
 bool QuitWithAppsController::ShouldQuit() {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
 
   // Quit immediately if this is a test.
   if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kTestType) &&
       !CommandLine::ForCurrentProcess()->HasSwitch(
@@ skipping 35 matching lines @@
 
   // Always return false, the notification UI can be used to quit all apps which
   // will cause Chrome to quit.
   return false;
 }
 
 // static
 void QuitWithAppsController::RegisterPrefs(PrefRegistrySimple* registry) {
   registry->RegisterBooleanPref(prefs::kNotifyWhenAppsKeepChromeAlive, true);
 }