Adds ash_mus_unittests to FYI bot

ash/display/display_configuration_controller_unittest.cc

Index: ash/display/display_configuration_controller_unittest.cc
diff --git a/ash/display/display_configuration_controller_unittest.cc b/ash/display/display_configuration_controller_unittest.cc
index bd3a8b3d36835f20423935f01c7cbec4207417ef..ed007f27b1084a1b403d8f40cefba10726474df1 100644
--- a/ash/display/display_configuration_controller_unittest.cc
+++ b/ash/display/display_configuration_controller_unittest.cc
@@ -12,14 +12,7 @@
 
 namespace ash {
 
-class DisplayConfigurationControllerTest : public test::AshTestBase {
- public:
-  DisplayConfigurationControllerTest() {}
-  ~DisplayConfigurationControllerTest() override {}
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(DisplayConfigurationControllerTest);
-};
+using DisplayConfigurationControllerTest = test::AshTestBase;
 
 TEST_F(DisplayConfigurationControllerTest, ErasesAnimatorOnAnimationEnded) {
   // TODO(wutao): needs display_configuration_controller