Use OnceCallback on Mojo interfaces in //chrome/common/extensions

chrome/browser/media_galleries/fileapi/safe_media_metadata_parser.h

Index: chrome/browser/media_galleries/fileapi/safe_media_metadata_parser.h
diff --git a/chrome/browser/media_galleries/fileapi/safe_media_metadata_parser.h b/chrome/browser/media_galleries/fileapi/safe_media_metadata_parser.h
index 4bad0b13d58febb4697d58a878d231489ea662c9..5152aa3fbca45cffeca05d08bc14388455725e26 100644
--- a/chrome/browser/media_galleries/fileapi/safe_media_metadata_parser.h
+++ b/chrome/browser/media_galleries/fileapi/safe_media_metadata_parser.h
@@ -71,19 +71,19 @@ class SafeMediaMetadataParser
   // Sequence of functions that bounces from the IO thread to the UI thread to
   // read the blob data, then sends the data back to the utility process.
   void StartBlobRequest(
-      const extensions::mojom::MediaDataSource::ReadBlobCallback& callback,
+      extensions::mojom::MediaDataSource::ReadBlobCallback callback,
       int64_t position,
       int64_t length);
   void StartBlobReaderOnUIThread(
-      const extensions::mojom::MediaDataSource::ReadBlobCallback& callback,
+      extensions::mojom::MediaDataSource::ReadBlobCallback callback,
       int64_t position,
       int64_t length);
   void BlobReaderDoneOnUIThread(
-      const extensions::mojom::MediaDataSource::ReadBlobCallback& callback,
+      extensions::mojom::MediaDataSource::ReadBlobCallback callback,
       std::unique_ptr<std::string> data,
       int64_t /* blob_total_size */);
   void FinishBlobRequest(
-      const extensions::mojom::MediaDataSource::ReadBlobCallback& callback,
+      extensions::mojom::MediaDataSource::ReadBlobCallback callback,
       std::unique_ptr<std::string> data);
 
   // All member variables are only accessed on the IO thread.