Revert of base: Remove use of MessageLoopProxy

base/files/file_proxy_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 "base/files/file_proxy.h"
 
 #include "base/bind.h"
 #include "base/files/file.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/memory/weak_ptr.h"
+#include "base/message_loop/message_loop.h"
 #include "base/threading/thread.h"
 #include "base/threading/thread_restrictions.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace base {
 
 class FileProxyTest : public testing::Test {
  public:
   FileProxyTest()
       : file_thread_("FileProxyTestFileThread"),
@@ skipping 49 matching lines @@
  protected:
   void CreateProxy(uint32 flags, FileProxy* proxy) {
     proxy->CreateOrOpen(
         test_path(), flags,
         Bind(&FileProxyTest::DidCreateOrOpen, weak_factory_.GetWeakPtr()));
     MessageLoop::current()->Run();
     EXPECT_TRUE(proxy->IsValid());
   }
 
   TaskRunner* file_task_runner() const {
-    return file_thread_.task_runner().get();
+    return file_thread_.message_loop_proxy().get();
   }
   const FilePath& test_dir_path() const { return dir_.path(); }
   const FilePath test_path() const { return dir_.path().AppendASCII("test"); }
 
   MessageLoopForIO message_loop_;
   Thread file_thread_;
 
   ScopedTempDir dir_;
   File::Error error_;
   FilePath path_;
@@ skipping 268 matching lines @@
   char buffer[53];
   EXPECT_EQ(53, base::ReadFile(test_path(), buffer, 53));
   int i = 0;
   for (; i < 10; ++i)
     EXPECT_EQ(kTestData[i], buffer[i]);
   for (; i < 53; ++i)
     EXPECT_EQ(0, buffer[i]);
 }
 
 }  // namespace base