Use ScopedTaskEnvironment instead of MessageLoopForUI in device tests.

device/geolocation/wifi_data_provider_chromeos_unittest.cc

Index: device/geolocation/wifi_data_provider_chromeos_unittest.cc
diff --git a/device/geolocation/wifi_data_provider_chromeos_unittest.cc b/device/geolocation/wifi_data_provider_chromeos_unittest.cc
index 9234cb0c3b257f2a859f7c4ffd0a864524a073a9..66d750ec1eba984a1e9b8aa81fd02510f92458ca 100644
--- a/device/geolocation/wifi_data_provider_chromeos_unittest.cc
+++ b/device/geolocation/wifi_data_provider_chromeos_unittest.cc
@@ -2,15 +2,15 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "base/message_loop/message_loop.h"
+#include "device/geolocation/wifi_data_provider_chromeos.h"
 #include "base/run_loop.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
+#include "base/test/scoped_task_environment.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
 #include "chromeos/dbus/shill_manager_client.h"
 #include "chromeos/network/geolocation_handler.h"
-#include "device/geolocation/wifi_data_provider_chromeos.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/cros_system_api/dbus/service_constants.h"
 
@@ -18,7 +18,9 @@ namespace device {
 
 class GeolocationChromeOsWifiDataProviderTest : public testing::Test {
  protected:
-  GeolocationChromeOsWifiDataProviderTest() {}
+  GeolocationChromeOsWifiDataProviderTest()
+      : scoped_task_environment_(
+            base::test::ScopedTaskEnvironment::MainThreadType::UI) {}
 
   void SetUp() override {
     chromeos::DBusThreadManager::Initialize();
@@ -59,7 +61,7 @@ class GeolocationChromeOsWifiDataProviderTest : public testing::Test {
     base::RunLoop().RunUntilIdle();
   }
 
-  base::MessageLoopForUI message_loop_;
+  base::test::ScopedTaskEnvironment scoped_task_environment_;
   scoped_refptr<WifiDataProviderChromeOs> provider_;
   chromeos::ShillManagerClient* manager_client_;
   chromeos::ShillManagerClient::TestInterface* manager_test_;