Remove call to IsRunningSequenceOnCurrentThread() in media_file_system_backend.cc

chrome/browser/media_galleries/fileapi/safe_picasa_album_table_reader.cc

Index: chrome/browser/media_galleries/fileapi/safe_picasa_album_table_reader.cc
diff --git a/chrome/browser/media_galleries/fileapi/safe_picasa_album_table_reader.cc b/chrome/browser/media_galleries/fileapi/safe_picasa_album_table_reader.cc
index 4a242e13ff3ce0cdff41bd55114fb3cce2747267..89f96c80827c61f480425e856cacdbe171ead647 100644
--- a/chrome/browser/media_galleries/fileapi/safe_picasa_album_table_reader.cc
+++ b/chrome/browser/media_galleries/fileapi/safe_picasa_album_table_reader.cc
@@ -26,11 +26,11 @@ SafePicasaAlbumTableReader::SafePicasaAlbumTableReader(
       parser_state_(INITIAL_STATE) {
   // TODO(tommycli): Add DCHECK to make sure |album_table_files| are all
   // opened read-only once security adds ability to check PlatformFiles.
-  DCHECK(MediaFileSystemBackend::CurrentlyOnMediaTaskRunnerThread());
+  MediaFileSystemBackend::AssertCurrentlyOnMediaSequence();
 }
 
 void SafePicasaAlbumTableReader::Start(const ParserCallback& callback) {
-  DCHECK(MediaFileSystemBackend::CurrentlyOnMediaTaskRunnerThread());
+  MediaFileSystemBackend::AssertCurrentlyOnMediaSequence();
   DCHECK(!callback.is_null());
 
   callback_ = callback;