Remove call to IsRunningSequenceOnCurrentThread() in media_file_system_backend.cc

chrome/browser/media_galleries/fileapi/file_path_watcher_util.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 "chrome/browser/media_galleries/fileapi/file_path_watcher_util.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/location.h"
 #include "base/logging.h"
@@ skipping 32 matching lines @@
   MediaFileSystemBackend::MediaTaskRunner()->PostTask(
       FROM_HERE, base::Bind(watch_started_callback, base::Passed(&watcher)));
 }
 
 }  // namespace
 
 void StartFilePathWatchOnMediaTaskRunner(
     const base::FilePath& path,
     const FileWatchStartedCallback& watch_started_callback,
     const base::FilePathWatcher::Callback& path_changed_callback) {
-  DCHECK(MediaFileSystemBackend::CurrentlyOnMediaTaskRunnerThread());
+  MediaFileSystemBackend::AssertCurrentlyOnMediaSequence();
   content::BrowserThread::PostTask(content::BrowserThread::FILE,
                                    FROM_HERE,
                                    base::Bind(&StartFilePathWatchOnFileThread,
                                               path,
                                               watch_started_callback,
                                               path_changed_callback));
 }