Convert utility process ParseMediaMetadata blob reading IPC to mojo

chrome/utility/media_galleries/media_metadata_parser.cc

Index: chrome/utility/media_galleries/media_metadata_parser.cc
diff --git a/chrome/utility/media_galleries/media_metadata_parser.cc b/chrome/utility/media_galleries/media_metadata_parser.cc
index 7085cb6ae0750258d8e204a1be1589cba3a1e0f1..aee251c8c6fb517cae5c598de120c2d04e00dc5d 100644
--- a/chrome/utility/media_galleries/media_metadata_parser.cc
+++ b/chrome/utility/media_galleries/media_metadata_parser.cc
@@ -114,15 +114,15 @@ void FinishParseAudioVideoMetadata(
 
 }  // namespace
 
-MediaMetadataParser::MediaMetadataParser(media::DataSource* source,
-                                         const std::string& mime_type,
-                                         bool get_attached_images)
-    : source_(source),
+MediaMetadataParser::MediaMetadataParser(
+    std::unique_ptr<media::DataSource> source,
+    const std::string& mime_type,
+    bool get_attached_images)
+    : source_(std::move(source)),
       mime_type_(mime_type),
-      get_attached_images_(get_attached_images) {
-}
+      get_attached_images_(get_attached_images) {}
 
-MediaMetadataParser::~MediaMetadataParser() {}
+MediaMetadataParser::~MediaMetadataParser() = default;
 
 void MediaMetadataParser::Start(const MetadataCallback& callback) {
   if (base::StartsWith(mime_type_, "audio/", base::CompareCase::SENSITIVE) ||
@@ -135,7 +135,7 @@ void MediaMetadataParser::Start(const MetadataCallback& callback) {
     media_thread_.reset(new base::Thread("media_thread"));
     CHECK(media_thread_->Start());
     media_thread_->task_runner()->PostTaskAndReply(
-        FROM_HERE, base::Bind(&ParseAudioVideoMetadata, source_,
+        FROM_HERE, base::Bind(&ParseAudioVideoMetadata, source_.get(),
                               get_attached_images_, metadata, attached_images),
         base::Bind(&FinishParseAudioVideoMetadata, callback,
                    base::Owned(metadata), base::Owned(attached_images)));