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

chrome/browser/media/router/mojo/media_router_mojo_impl.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/media/router/mojo/media_router_mojo_impl.h"
 
 #include <stddef.h>
 
 #include <utility>
 
@@ skipping 327 matching lines @@
     const std::vector<MediaRouteResponseCallback>& callbacks,
     base::TimeDelta timeout,
     bool off_the_record) {
   DCHECK(thread_checker_.CalledOnValidThread());
 
   std::unique_ptr<RouteRequestResult> error_result;
   if (!origin.is_valid()) {
     DVLOG_WITH_INSTANCE(1) << "Invalid origin: " << origin;
     error_result = RouteRequestResult::FromError(
         "Invalid origin", RouteRequestResult::INVALID_ORIGIN);
-  } else if (!HasLocalRoute()) {
-    DVLOG_WITH_INSTANCE(1) << "No local routes";
+  } else if (!HasJoinableRoute()) {
+    DVLOG_WITH_INSTANCE(1) << "No joinable routes";
     error_result = RouteRequestResult::FromError(
         "Route not found", RouteRequestResult::ROUTE_NOT_FOUND);
   }
 
   if (error_result) {
     for (const MediaRouteResponseCallback& callback : callbacks)
       callback.Run(*error_result);
     return;
   }
 
@@ skipping 677 matching lines @@
                         base::Unretained(this), source_id));
 }
 
 void MediaRouterMojoImpl::DoUpdateMediaSinks(
     const MediaSource::Id& source_id) {
   DVLOG_WITH_INSTANCE(1) << "DoUpdateMediaSinks" << source_id;
   media_route_provider_->UpdateMediaSinks(source_id);
 }
 
 }  // namespace media_router