Remove all remaining traces of MessageLoopProxy.

content/browser/media/capture/aura_window_capture_machine.cc

 // 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.
 
 #include "content/browser/media/capture/aura_window_capture_machine.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "base/logging.h"
@@ skipping 70 matching lines @@
   // Start observing compositor updates.
   aura::WindowTreeHost* const host = desktop_window_->GetHost();
   ui::Compositor* const compositor = host ? host->compositor() : nullptr;
   if (!compositor)
     return false;
   compositor->AddAnimationObserver(this);
 
   power_save_blocker_.reset(new device::PowerSaveBlocker(
       device::PowerSaveBlocker::kPowerSaveBlockPreventDisplaySleep,
       device::PowerSaveBlocker::kReasonOther, "DesktopCaptureDevice is running",
-      BrowserThread::GetMessageLoopProxyForThread(BrowserThread::UI),
-      BrowserThread::GetMessageLoopProxyForThread(BrowserThread::FILE)));
+      BrowserThread::GetTaskRunnerForThread(BrowserThread::UI),
+      BrowserThread::GetTaskRunnerForThread(BrowserThread::FILE)));
 
   return true;
 }
 
 void AuraWindowCaptureMachine::Stop(const base::Closure& callback) {
   // Stops the capture machine asynchronously.
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE, base::Bind(
           &AuraWindowCaptureMachine::InternalStop,
           base::Unretained(this),
@@ skipping 308 matching lines @@
   Capture(timestamp);
 }
 
 void AuraWindowCaptureMachine::OnCompositingShuttingDown(
     ui::Compositor* compositor) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   compositor->RemoveAnimationObserver(this);
 }
 
 }  // namespace content