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

chrome/browser/media/router/media_source.h

Index: chrome/browser/media/router/media_source.h
diff --git a/chrome/browser/media/router/media_source.h b/chrome/browser/media/router/media_source.h
index 288cb27b7791bdfdca6d04ce345df9aeb64ce604..1f3abac3721c4033af56e01474435f28b053beb1 100644
--- a/chrome/browser/media/router/media_source.h
+++ b/chrome/browser/media/router/media_source.h
@@ -20,17 +20,13 @@ class MediaSource {
   using Id = std::string;
 
   explicit MediaSource(const MediaSource::Id& id);
-  MediaSource();
   ~MediaSource();
 
   // Gets the ID of the media source.
   MediaSource::Id id() const;
 
   // Returns true if two MediaSource objects use the same media ID.
-  bool Equals(const MediaSource& other) const;
-
-  // Returns true if a MediaSource is empty or uninitialized.
-  bool Empty() const;
+  bool operator==(const MediaSource& other) const;
 
   // Used for logging.
   std::string ToString() const;