[Media Router] Conditionally enable mDNS on Windows.

chrome/browser/media/router/media_router_mojo_test.cc

Index: chrome/browser/media/router/media_router_mojo_test.cc
diff --git a/chrome/browser/media/router/media_router_mojo_test.cc b/chrome/browser/media/router/media_router_mojo_test.cc
index e5cd81446b3b99f58bdbf4acf270dd4567576bcc..3eccb482614ecea24a2d2739213e3306deb0b235 100644
--- a/chrome/browser/media/router/media_router_mojo_test.cc
+++ b/chrome/browser/media/router/media_router_mojo_test.cc
@@ -29,7 +29,7 @@ MockMediaRouteProvider::~MockMediaRouteProvider() {
 
 MediaRouterMojoTest::MediaRouterMojoTest()
     : mock_media_router_(new MediaRouterMojoImpl(&mock_event_page_tracker_)),
-      message_loop_(mojo::common::MessagePumpMojo::Create()) {
+      run_loop_(new base::RunLoop()) {
   mock_media_router_->set_instance_id_for_test(kInstanceId);
   extension_ = extensions::test_util::CreateEmptyExtension();
 }
@@ -57,11 +57,13 @@ void MediaRouterMojoTest::SetUp() {
   ON_CALL(mock_event_page_tracker_, IsEventPageSuspended(extension_id()))
       .WillByDefault(testing::Return(false));
   ConnectProviderManagerService();
-  message_loop_.RunUntilIdle();
+  run_loop_->RunUntilIdle();
+  run_loop_.reset(new base::RunLoop());
 }
 
 void MediaRouterMojoTest::ProcessEventLoop() {
-  message_loop_.RunUntilIdle();
+  run_loop_->RunUntilIdle();
+  run_loop_.reset(new base::RunLoop());
 }
 
 }  // namespace media_router