Revert of Media Galleries Partial Deprecation: Remove image metadata & libexif.

chrome/utility/media_galleries/media_metadata_parser.h

 // 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.
 
 #ifndef CHROME_UTILITY_MEDIA_GALLERIES_MEDIA_METADATA_PARSER_H_
 #define CHROME_UTILITY_MEDIA_GALLERIES_MEDIA_METADATA_PARSER_H_
 
 #include <string>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "chrome/common/extensions/api/media_galleries.h"
 #include "chrome/common/media_galleries/metadata_types.h"
 
 namespace base {
 class Thread;
 }
 
 namespace media {
 class DataSource;
 }
 
 namespace metadata {
 
 // This class takes a MIME type and data source and parses its metadata. It
-// handles audio, video, and images. It delegates its operations to FFMPEG.
-// This class lives and operates on the utility thread of the utility process,
-// as we wish to sandbox potentially dangerous operations on user-provided data.
+// handles audio, video, and images. It delegates its operations to FFMPEG,
+// libexif, etc. This class lives and operates on the utility thread of the
+// utility process, as we wish to sandbox potentially dangerous operations
+// on user-provided data.
 class MediaMetadataParser {
  public:
   typedef extensions::api::media_galleries::MediaMetadata MediaMetadata;
   typedef base::Callback<
       void(const MediaMetadata& metadata,
            const std::vector<AttachedImage>& attached_images)>
   MetadataCallback;
 
   // Does not take ownership of |source|. Caller is responsible for ensuring
   // that |source| outlives this object.
@@ skipping 18 matching lines @@
   // TODO(tommycli): Replace with a reference to a WorkerPool if we ever use
   // this class in batch mode.
   scoped_ptr<base::Thread> media_thread_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaMetadataParser);
 };
 
 }  // namespace metadata
 
 #endif  // CHROME_UTILITY_MEDIA_GALLERIES_MEDIA_METADATA_PARSER_H_