Remove call to IsRunningSequenceOnCurrentThread() in media_file_system_backend.cc

chrome/browser/media_galleries/fileapi/media_file_system_backend.h

 // Copyright (c) 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.
 
 #ifndef CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_MEDIA_FILE_SYSTEM_BACKEND_H_
 #define CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_MEDIA_FILE_SYSTEM_BACKEND_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 25 matching lines @@
 
 class MediaFileSystemBackend : public storage::FileSystemBackend {
  public:
   static const char kMediaTaskRunnerName[];
 
   MediaFileSystemBackend(
       const base::FilePath& profile_path,
       base::SequencedTaskRunner* media_task_runner);
   ~MediaFileSystemBackend() override;
 
-  static bool CurrentlyOnMediaTaskRunnerThread();
+  // Asserts that the current task is sequenced with any other task that calls
+  // this.
+  static void AssertCurrentlyOnMediaSequence();
+
   static scoped_refptr<base::SequencedTaskRunner> MediaTaskRunner();
 
   // Construct the mount point for the gallery specified by |pref_id| in
   // the profile located in |profile_path|.
   static std::string ConstructMountName(const base::FilePath& profile_path,
                                         const std::string& extension_id,
                                         MediaGalleryPrefId pref_id);
 
   static bool AttemptAutoMountForURLRequest(
       const net::URLRequest* url_request,
@@ skipping 57 matching lines @@
 
   // Used for usage UMA tracking.
   bool picasa_file_util_used_;
   bool itunes_file_util_used_;
 #endif  // defined(OS_WIN) || defined(OS_MACOSX)
 
   DISALLOW_COPY_AND_ASSIGN(MediaFileSystemBackend);
 };
 
 #endif  // CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_MEDIA_FILE_SYSTEM_BACKEND_H_