Remove remaining calls to deprecated MessageLoop methods on Mac.

base/files/file_path_watcher_unittest.cc

 // Copyright (c) 2012 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_path_watcher.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #include <aclapi.h>
 #elif defined(OS_POSIX)
@@ skipping 179 matching lines @@
   }
 
   bool SetupWatch(const FilePath& target,
                   FilePathWatcher* watcher,
                   TestDelegateBase* delegate,
                   bool recursive_watch) WARN_UNUSED_RESULT;
 
   bool WaitForEvents() WARN_UNUSED_RESULT {
     collector_->Reset();
     // Make sure we timeout if we don't get notified.
-    loop_.PostDelayedTask(FROM_HERE,
-                          MessageLoop::QuitWhenIdleClosure(),
-                          TestTimeouts::action_timeout());
+    loop_.task_runner()->PostDelayedTask(FROM_HERE,
+                                         MessageLoop::QuitWhenIdleClosure(),
+                                         TestTimeouts::action_timeout());
     RunLoop().Run();
     return collector_->Success();
   }
 
   NotificationCollector* collector() { return collector_.get(); }
 
   MessageLoop loop_;
   base::Thread file_thread_;
   ScopedTempDir temp_dir_;
   scoped_refptr<NotificationCollector> collector_;
@@ skipping 692 matching lines @@
   ASSERT_TRUE(ChangeFilePermissions(test_dir1, Execute, false));
   ASSERT_TRUE(WaitForEvents());
   ASSERT_TRUE(ChangeFilePermissions(test_dir1, Execute, true));
   DeleteDelegateOnFileThread(delegate.release());
 }
 
 #endif  // OS_MACOSX
 }  // namespace
 
 }  // namespace base