[Presentation API] Add support for multiple URLs in PresentationRequest on Media Router UI side

chrome/browser/media/router/media_source.cc

Index: chrome/browser/media/router/media_source.cc
diff --git a/chrome/browser/media/router/media_source.cc b/chrome/browser/media/router/media_source.cc
index 87b4d78788759bd58db0d1b8e166dc5903e0011a..383ccc58aa636e9bb5b4ccce431fa9eb290e973d 100644
--- a/chrome/browser/media/router/media_source.cc
+++ b/chrome/browser/media/router/media_source.cc
@@ -11,23 +11,16 @@ namespace media_router {
 MediaSource::MediaSource(const MediaSource::Id& source_id) : id_(source_id) {
 }
 
-MediaSource::MediaSource() {
-}
-
 MediaSource::~MediaSource() {}
 
 MediaSource::Id MediaSource::id() const {
   return id_;
 }
 
-bool MediaSource::Equals(const MediaSource& other) const {
+bool MediaSource::operator==(const MediaSource& other) const {
   return id_ == other.id();
 }
 
-bool MediaSource::Empty() const {
-  return id_.empty();
-}
-
 std::string MediaSource::ToString() const {
   return "MediaSource[" + id_ + "]";
 }