Remove all remaining traces of MessageLoopProxy.

chrome/browser/sync_file_system/drive_backend/drive_backend_sync_unittest.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 <stddef.h>
 #include <stdint.h>
 #include <algorithm>
 #include <stack>
 #include <utility>
 
@@ skipping 67 matching lines @@
   DriveBackendSyncTest()
       : thread_bundle_(content::TestBrowserThreadBundle::IO_MAINLOOP),
         pending_remote_changes_(0),
         pending_local_changes_(0) {}
   ~DriveBackendSyncTest() override {}
 
   void SetUp() override {
     ASSERT_TRUE(base_dir_.CreateUniqueTempDir());
     in_memory_env_.reset(leveldb::NewMemEnv(leveldb::Env::Default()));
 
-    io_task_runner_ = content::BrowserThread::GetMessageLoopProxyForThread(
+    io_task_runner_ = content::BrowserThread::GetTaskRunnerForThread(
         content::BrowserThread::IO);
     scoped_refptr<base::SequencedWorkerPool> worker_pool(
         content::BrowserThread::GetBlockingPool());
     worker_task_runner_ =
         worker_pool->GetSequencedTaskRunnerWithShutdownBehavior(
             worker_pool->GetSequenceToken(),
             base::SequencedWorkerPool::SKIP_ON_SHUTDOWN);
-    file_task_runner_ = content::BrowserThread::GetMessageLoopProxyForThread(
+    file_task_runner_ = content::BrowserThread::GetTaskRunnerForThread(
         content::BrowserThread::FILE);
     scoped_refptr<base::SequencedTaskRunner> drive_task_runner =
         worker_pool->GetSequencedTaskRunnerWithShutdownBehavior(
             worker_pool->GetSequenceToken(),
             base::SequencedWorkerPool::SKIP_ON_SHUTDOWN);
 
     RegisterSyncableFileSystem();
     local_sync_service_ = LocalFileSyncService::CreateForTesting(
         &profile_, in_memory_env_.get());
     local_sync_service_->AddChangeObserver(this);
@@ skipping 1616 matching lines @@
 
   EXPECT_EQ(1u, CountApp());
   EXPECT_EQ(1u, CountLocalFile(app_id));
 
   EXPECT_EQ(2u, CountMetadata());
   EXPECT_EQ(2u, CountTracker());
 }
 
 }  // namespace drive_backend
 }  // namespace sync_file_system