Remove all remaining traces of MessageLoopProxy.

content/browser/fileapi/file_system_operation_runner_unittest.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 <utility>
 
 #include "base/files/file_path.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/macros.h"
 #include "base/memory/scoped_vector.h"
@@ skipping 176 matching lines @@
             content::TestBrowserThreadBundle::REAL_FILE_THREAD |
             content::TestBrowserThreadBundle::IO_MAINLOOP) {}
 
   void SetUp() override {
     ASSERT_TRUE(base_.CreateUniqueTempDir());
 
     base::FilePath base_dir = base_.path();
     ScopedVector<storage::FileSystemBackend> additional_providers;
     file_system_context_ = new FileSystemContext(
         base::ThreadTaskRunnerHandle::Get().get(),
-        BrowserThread::GetMessageLoopProxyForThread(BrowserThread::FILE).get(),
+        BrowserThread::GetTaskRunnerForThread(BrowserThread::FILE).get(),
         storage::ExternalMountPoints::CreateRefCounted().get(),
         make_scoped_refptr(new MockSpecialStoragePolicy()).get(), nullptr,
         std::move(additional_providers),
         std::vector<storage::URLRequestAutoMountHandler>(), base_dir,
         CreateAllowFileAccessOptions());
 
     // Disallow IO on the main loop.
     base::ThreadRestrictions::SetIOAllowed(false);
   }
 
@@ skipping 33 matching lines @@
   base::RunLoop run_loop;
   BrowserThread::PostTaskAndReply(
       BrowserThread::FILE, FROM_HERE,
       base::Bind(&base::DoNothing),
       run_loop.QuitClosure());
   run_loop.Run();
   // This should finish without thread assertion failure on debug build.
 }
 
 }  // namespace content