Replace device_sensor browsertest by service unittest.

services/service_manager/public/cpp/lib/service_test.cc

Index: services/service_manager/public/cpp/lib/service_test.cc
diff --git a/services/service_manager/public/cpp/lib/service_test.cc b/services/service_manager/public/cpp/lib/service_test.cc
index 30fd49b12a32b7d9b33f04133a96ca3d872bd48e..3879d470bd1704a4daa0e9bdee1b2326062bf390 100644
--- a/services/service_manager/public/cpp/lib/service_test.cc
+++ b/services/service_manager/public/cpp/lib/service_test.cc
@@ -49,7 +49,7 @@ std::unique_ptr<Service> ServiceTest::CreateService() {
 }
 
 std::unique_ptr<base::MessageLoop> ServiceTest::CreateMessageLoop() {
-  return base::MakeUnique<base::MessageLoop>();
+  return base::MakeUnique<base::MessageLoop>(base::MessageLoop::TYPE_UI);
 }
 
 void ServiceTest::OnStartCalled(Connector* connector,