[MediaRouter] Update JoinRoute behavior to allow non-local routes.

chrome/browser/media/router/media_router_base.h

Index: chrome/browser/media/router/media_router_base.h
diff --git a/chrome/browser/media/router/media_router_base.h b/chrome/browser/media/router/media_router_base.h
index 933f840de134a797bd056899ebc683180174eee3..edcfca375bf2222b673d717c43ac407266262db8 100644
--- a/chrome/browser/media/router/media_router_base.h
+++ b/chrome/browser/media/router/media_router_base.h
@@ -52,8 +52,9 @@ class MediaRouterBase : public MediaRouter {
       content::PresentationConnectionCloseReason reason,
       const std::string& message);
 
-  // Returns true when there is at least one MediaRoute with is_local = true.
-  bool HasLocalRoute() const;
+  // Returns true when there is at least one MediaRoute that can be returned by
+  // JoinRoute().
+  bool HasJoinableRoute() const;
 
   using PresentationConnectionStateChangedCallbacks = base::CallbackList<void(
       const content::PresentationConnectionStateChangeInfo&)>;