Replace chromeos::UserManager::Get() with chromeos::GetUserManager().

chrome/browser/extensions/extension_garbage_collector_chromeos.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/extensions/extension_garbage_collector_chromeos.h"
 #include "chrome/browser/chromeos/login/users/user_manager.h"
 #include "chrome/browser/chromeos/profiles/profile_helper.h"
 #include "chrome/browser/extensions/extension_assets_manager_chromeos.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "extensions/browser/extension_system.h"
@@ skipping 31 matching lines @@
   ExtensionGarbageCollector::GarbageCollectExtensions();
 
   if (!shared_extensions_garbage_collected_ &&
       CanGarbageCollectSharedExtensions()) {
     GarbageCollectSharedExtensions();
     shared_extensions_garbage_collected_ = true;
   }
 }
 
 bool ExtensionGarbageCollectorChromeOS::CanGarbageCollectSharedExtensions() {
-  chromeos::UserManager* user_manager = chromeos::UserManager::Get();
+  chromeos::UserManager* user_manager = chromeos::GetUserManager();
   if (!user_manager) {
     NOTREACHED();
     return false;
   }
 
   const chromeos::UserList& active_users = user_manager->GetLoggedInUsers();
   for (size_t i = 0; i < active_users.size(); i++) {
     Profile* profile =
         chromeos::ProfileHelper::Get()->GetProfileByUser(active_users[i]);
     ExtensionGarbageCollectorChromeOS* gc =
@@ skipping 14 matching lines @@
             FROM_HERE,
             base::Bind(&GarbageCollectExtensionsOnFileThread,
                        ExtensionAssetsManagerChromeOS::GetSharedInstallDir(),
                        paths))) {
       NOTREACHED();
     }
   }
 }
 
 }  // namespace extensions