Remove call to IsRunningSequenceOnCurrentThread() in media_file_system_backend.cc

chrome/browser/media_galleries/fileapi/media_file_system_backend.h

Index: chrome/browser/media_galleries/fileapi/media_file_system_backend.h
diff --git a/chrome/browser/media_galleries/fileapi/media_file_system_backend.h b/chrome/browser/media_galleries/fileapi/media_file_system_backend.h
index abbc33d6d9a897560c93c331486375fc99cdb8cc..6db0a68e053a660c6bf62b7270e0a0d7ca79cafe 100644
--- a/chrome/browser/media_galleries/fileapi/media_file_system_backend.h
+++ b/chrome/browser/media_galleries/fileapi/media_file_system_backend.h
@@ -43,7 +43,10 @@ class MediaFileSystemBackend : public storage::FileSystemBackend {
       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