renames mus_ws_unittests to ui_service_unittests

testing/buildbot/chromium.chromiumos.json

 {
   "Linux ChromiumOS Builder": {
     "additional_compile_targets": [
       "All"
     ]
   },
   "Linux ChromiumOS Ozone Tests (1)": {
     "gtest_tests": [
       {
         "swarming": {
@@ skipping 291 matching lines @@
       {
         "swarming": {
           "can_use_on_swarming_builders": true
         },
         "test": "mus_gpu_unittests"
       },
       {
         "swarming": {
           "can_use_on_swarming_builders": true
         },
-        "test": "mus_ws_unittests"
-      },
-      {
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        },
         "test": "nacl_helper_nonsfi_unittests"
       },
       {
         "swarming": {
           "can_use_on_swarming_builders": true
         },
         "test": "nacl_loader_unittests"
       },
       {
         "swarming": {
@@ skipping 97 matching lines @@
       {
         "swarming": {
           "can_use_on_swarming_builders": true
         },
         "test": "ui_chromeos_unittests"
       },
       {
         "swarming": {
           "can_use_on_swarming_builders": true
         },
+        "test": "ui_service_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "ui_struct_traits_unittests"
       },
       {
         "swarming": {
           "can_use_on_swarming_builders": true
         },
         "test": "ui_touch_selection_unittests"
       },
       {
         "args": [
@@ skipping 756 matching lines @@
       },
       {
         "swarming": {
           "can_use_on_swarming_builders": true
         },
         "test": "wm_unittests"
       }
     ]
   }
 }