[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..e348fe21c55977b2412473deb669c94449457164 100644
--- a/chrome/browser/media/router/media_sink.h
+++ b/chrome/browser/media/router/media_sink.h
@@ -7,6 +7,7 @@
 
 #include <string>
 
+#include "base/optional.h"
 #include "third_party/icu/source/common/unicode/uversion.h"
 
 namespace U_ICU_NAMESPACE {
@@ -34,19 +35,28 @@ class MediaSink {
   MediaSink(const MediaSink::Id& sink_id,
             const std::string& name,
             const IconType icon_type);
-
   MediaSink(const MediaSink& other);
+  MediaSink();
 
   ~MediaSink();
 
+  void set_sink_id(const MediaSink::Id& sink_id) { sink_id_ = sink_id; }
   const MediaSink::Id& id() const { return sink_id_; }
+
+  void set_name(const std::string& name) { name_ = name; }
   const std::string& name() const { return name_; }
+
   void set_description(const std::string& description) {
     description_ = description;
   }
-  const std::string& description() const { return description_; }
+  const base::Optional<std::string>& description() const {
+    return description_;
+  }
+
   void set_domain(const std::string& domain) { domain_ = domain; }
-  const std::string& domain() const { return domain_; }
+  const base::Optional<std::string>& domain() const { return domain_; }
+
+  void set_icon_type(IconType icon_type) { icon_type_ = icon_type; }
   IconType icon_type() const { return icon_type_; }
 
   bool Equals(const MediaSink& other) const;
@@ -71,13 +81,13 @@ class MediaSink {
   std::string name_;
 
   // Optional description of the MediaSink.
-  std::string description_;
+  base::Optional<std::string> description_;
 
   // Optional domain of the MediaSink.
-  std::string domain_;
+  base::Optional<std::string> domain_;
 
   // The type of icon that corresponds with the MediaSink.
-  IconType icon_type_;
+  IconType icon_type_ = IconType::GENERIC;
 };
 
 }  // namespace media_router