Remove call to IsRunningSequenceOnCurrentThread() in media_file_system_backend.cc

chrome/browser/media_galleries/fileapi/safe_iapps_library_parser.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/safe_iapps_library_parser.h"
 
 #include <utility>
 
 #include "build/build_config.h"
 #include "chrome/browser/media_galleries/fileapi/media_file_system_backend.h"
@@ skipping 15 matching lines @@
 
 void SafeIAppsLibraryParser::ParseITunesLibrary(
     const base::FilePath& library_file,
     const ITunesParserCallback& callback) {
   library_file_path_ = library_file;
   itunes_callback_ = callback;
   Start();
 }
 
 void SafeIAppsLibraryParser::Start() {
-  DCHECK(MediaFileSystemBackend::CurrentlyOnMediaTaskRunnerThread());
+  MediaFileSystemBackend::AssertCurrentlyOnMediaSequence();
 
   // |library_file_| will be closed on the IO thread once it has been handed
   // off to the child process.
   library_file_.Initialize(library_file_path_,
                            base::File::FLAG_OPEN | base::File::FLAG_READ);
   if (!library_file_.IsValid()) {
     VLOG(1) << "Could not open iApps library XML file: "
             << library_file_path_.value();
     BrowserThread::PostTask(
         BrowserThread::IO, FROM_HERE,
@@ skipping 58 matching lines @@
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(SafeIAppsLibraryParser, message)
     IPC_MESSAGE_HANDLER(ChromeUtilityHostMsg_GotITunesLibrary,
                         OnGotITunesLibrary)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
 }
 
 }  // namespace iapps