[Media Router] Convert to use typemaps for media_router.mojom.

chrome/browser/media/router/media_sink.h

Index: chrome/browser/media/router/media_sink.h
diff --git a/chrome/browser/media/router/media_sink.h b/chrome/browser/media/router/media_sink.h
index e12b6b16f55de968635b3955b6f2484c8dfe3d5e..c6c0cf106dd6b73c0bcfa4ea0342fea307549dbf 100644
--- a/chrome/browser/media/router/media_sink.h
+++ b/chrome/browser/media/router/media_sink.h
@@ -63,6 +63,12 @@ class MediaSink {
     }
   };
 
+  // Used by Mojo.
+  MediaSink();
+  void set_sink_id(const MediaSink::Id& sink_id) { sink_id_ = sink_id; }
+  void set_name(const std::string& name) { name_ = name; }
+  void set_icon_type(IconType icon_type) { icon_type_ = icon_type; }
+
  private:
   // Unique identifier for the MediaSink.
   MediaSink::Id sink_id_;
@@ -77,7 +83,7 @@ class MediaSink {
   std::string domain_;
 
   // The type of icon that corresponds with the MediaSink.
-  IconType icon_type_;
+  IconType icon_type_ = IconType::GENERIC;
 };
 
 }  // namespace media_router