[Media Router] Conditionally enable mDNS on Windows.

chrome/browser/media/router/media_router_mojo_test.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/media_router_mojo_test.h"
 
 #include <utility>
 
 #include "mojo/message_pump/message_pump_mojo.h"
 
@@ skipping 10 matching lines @@
 }  // namespace
 
 MockMediaRouteProvider::MockMediaRouteProvider() {
 }
 
 MockMediaRouteProvider::~MockMediaRouteProvider() {
 }
 
 MediaRouterMojoTest::MediaRouterMojoTest()
     : extension_id_("ext-123"),
-      mock_media_router_(new MediaRouterMojoImpl(&mock_event_page_tracker_)),
-      message_loop_(mojo::common::MessagePumpMojo::Create()) {
+      mock_media_router_(new MediaRouterMojoImpl(&mock_event_page_tracker_)) {
   mock_media_router_->set_instance_id_for_test(kInstanceId);
 }
 
 MediaRouterMojoTest::~MediaRouterMojoTest() {
 }
 
 void MediaRouterMojoTest::ConnectProviderManagerService() {
   // Bind the |media_route_provider| interface to |media_route_provider_|.
   auto request = mojo::GetProxy(&media_router_proxy_);
   mock_media_router_->BindToMojoRequest(std::move(request), extension_id_);
 
   // Bind the Mojo MediaRouter interface used by |mock_media_router_| to
   // |mock_media_route_provider_service_|.
   interfaces::MediaRouteProviderPtr mojo_media_router;
   binding_.reset(new mojo::Binding<interfaces::MediaRouteProvider>(
       &mock_media_route_provider_, mojo::GetProxy(&mojo_media_router)));
   media_router_proxy_->RegisterMediaRouteProvider(
       std::move(mojo_media_router),
       base::Bind(&ExpectAsyncResultEqual<std::string, mojo::String>,
                  kInstanceId));
 }
 
 void MediaRouterMojoTest::SetUp() {
   ON_CALL(mock_event_page_tracker_, IsEventPageSuspended(extension_id_))
       .WillByDefault(testing::Return(false));
   ConnectProviderManagerService();
-  message_loop_.RunUntilIdle();
+  base::RunLoop().RunUntilIdle();
 }
 
 void MediaRouterMojoTest::ProcessEventLoop() {
-  message_loop_.RunUntilIdle();
+  base::RunLoop().RunUntilIdle();
 }
 
 }  // namespace media_router