[Media Router] Conditionally enable mDNS on Windows.

chrome/browser/media/router/media_router_mojo_test.h

Index: chrome/browser/media/router/media_router_mojo_test.h
diff --git a/chrome/browser/media/router/media_router_mojo_test.h b/chrome/browser/media/router/media_router_mojo_test.h
index e56aa7cad2e5ac0aa4dbe19f6ba251c322af0d68..2d558dc5d0d954052a8c73f8d49efe94699c3cff 100644
--- a/chrome/browser/media/router/media_router_mojo_test.h
+++ b/chrome/browser/media/router/media_router_mojo_test.h
@@ -8,11 +8,13 @@
 #include <string>
 
 #include "base/macros.h"
-#include "base/message_loop/message_loop.h"
+#include "base/memory/ref_counted.h"
+#include "base/run_loop.h"
 #include "chrome/browser/media/router/media_router_mojo_impl.h"
 #include "chrome/browser/media/router/mock_media_router.h"
 #include "chrome/browser/media/router/test_helper.h"
 #include "chrome/test/base/testing_profile.h"
+#include "content/public/test/test_browser_thread_bundle.h"
 #include "mojo/public/cpp/bindings/binding.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ -48,10 +50,10 @@ class MediaRouterMojoTest : public ::testing::Test {
   media_router::interfaces::MediaRouterPtr media_router_proxy_;
 
  private:
+  content::TestBrowserThreadBundle test_thread_bundle_;
   std::string extension_id_;
   scoped_ptr<MediaRouterMojoImpl> mock_media_router_;
   scoped_ptr<mojo::Binding<interfaces::MediaRouteProvider>> binding_;
-  base::MessageLoop message_loop_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaRouterMojoTest);
 };