Use ScopedTaskEnvironment instead of MessageLoopForUI in chromeos tests.

chromeos/network/shill_property_handler_unittest.cc

Index: chromeos/network/shill_property_handler_unittest.cc
diff --git a/chromeos/network/shill_property_handler_unittest.cc b/chromeos/network/shill_property_handler_unittest.cc
index 47e169e4e4506e4bb0c9973453ed5d62527b7721..d389879454ce24f6ba3c30d84cded593adafe4d3 100644
--- a/chromeos/network/shill_property_handler_unittest.cc
+++ b/chromeos/network/shill_property_handler_unittest.cc
@@ -13,8 +13,8 @@
 
 #include "base/bind.h"
 #include "base/macros.h"
-#include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
+#include "base/test/scoped_task_environment.h"
 #include "base/values.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
 #include "chromeos/dbus/shill_device_client.h"
@@ -163,11 +163,12 @@ class TestListener : public internal::ShillPropertyHandler::Listener {
 class ShillPropertyHandlerTest : public testing::Test {
  public:
   ShillPropertyHandlerTest()
-      : manager_test_(NULL),
+      : scoped_task_environment_(
+            base::test::ScopedTaskEnvironment::MainThreadType::UI),
+        manager_test_(NULL),
         device_test_(NULL),
         service_test_(NULL),
-        profile_test_(NULL) {
-  }
+        profile_test_(NULL) {}
   ~ShillPropertyHandlerTest() override {}
 
   void SetUp() override {
@@ -285,7 +286,7 @@ class ShillPropertyHandlerTest : public testing::Test {
     AddService(shill::kTypeCellular, "stub_cellular1", shill::kStateIdle);
   }
 
-  base::MessageLoopForUI message_loop_;
+  base::test::ScopedTaskEnvironment scoped_task_environment_;
   std::unique_ptr<TestListener> listener_;
   std::unique_ptr<internal::ShillPropertyHandler> shill_property_handler_;
   ShillManagerClient::TestInterface* manager_test_;