Remove all remaining traces of MessageLoopProxy.

extensions/browser/api/power/power_api.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 "extensions/browser/api/power/power_api.h"
 
 #include "base/bind.h"
 #include "base/lazy_instance.h"
 #include "content/public/browser/browser_thread.h"
 #include "device/power_save_blocker/power_save_blocker.h"
@@ skipping 109 matching lines @@
   // If the level changed and we need to create a new blocker, do a swap
   // to ensure that there isn't a brief period where power management is
   // unblocked.
   if (!power_save_blocker_ || new_level != current_level_) {
     device::PowerSaveBlocker::PowerSaveBlockerType type =
         LevelToPowerSaveBlockerType(new_level);
     std::unique_ptr<device::PowerSaveBlocker> new_blocker(
         create_blocker_function_.Run(
             type, device::PowerSaveBlocker::kReasonOther,
             kPowerSaveBlockerDescription,
-            content::BrowserThread::GetMessageLoopProxyForThread(
+            content::BrowserThread::GetTaskRunnerForThread(
                 content::BrowserThread::UI),
-            content::BrowserThread::GetMessageLoopProxyForThread(
+            content::BrowserThread::GetTaskRunnerForThread(
                 content::BrowserThread::FILE)));
     power_save_blocker_.swap(new_blocker);
     current_level_ = new_level;
   }
 }
 
 void PowerAPI::Shutdown() {
   // Unregister here rather than in the d'tor; otherwise this call will recreate
   // the already-deleted ExtensionRegistry.
   ExtensionRegistry::Get(browser_context_)->RemoveObserver(this);
   power_save_blocker_.reset();
 }
 
 }  // namespace extensions