Remove all remaining traces of MessageLoopProxy.

content/browser/wake_lock/wake_lock_service_context.cc

Index: content/browser/wake_lock/wake_lock_service_context.cc
diff --git a/content/browser/wake_lock/wake_lock_service_context.cc b/content/browser/wake_lock/wake_lock_service_context.cc
index b17b51851d2d5ce8d8b6c43cdb786a1d50341d1a..674f130a700922e5c37e6ae362f355dd78646b72 100644
--- a/content/browser/wake_lock/wake_lock_service_context.cc
+++ b/content/browser/wake_lock/wake_lock_service_context.cc
@@ -69,8 +69,8 @@ void WakeLockServiceContext::CreateWakeLock() {
   wake_lock_.reset(new device::PowerSaveBlocker(
       device::PowerSaveBlocker::kPowerSaveBlockPreventDisplaySleep,
       device::PowerSaveBlocker::kReasonOther, "Wake Lock API",
-      BrowserThread::GetMessageLoopProxyForThread(BrowserThread::UI),
-      BrowserThread::GetMessageLoopProxyForThread(BrowserThread::FILE)));
+      BrowserThread::GetTaskRunnerForThread(BrowserThread::UI),
+      BrowserThread::GetTaskRunnerForThread(BrowserThread::FILE)));
 
 #if defined(OS_ANDROID)
   // On Android, additionaly associate the blocker with this WebContents.