renames mus_ws_unittests to ui_service_unittests

testing/buildbot/chromium.win.json

 {
   "Win 7 Tests x64 (1)": {
     "gtest_tests": [
       {
         "swarming": {
           "can_use_on_swarming_builders": true
         },
         "test": "accessibility_unittests"
       },
       {
@@ skipping 295 matching lines @@
       {
         "swarming": {
           "can_use_on_swarming_builders": true
         },
         "test": "mus_public_unittests"
       },
       {
         "swarming": {
           "can_use_on_swarming_builders": true
         },
-        "test": "mus_ws_unittests"
-      },
-      {
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        },
         "test": "nacl_loader_unittests"
       },
       {
         "swarming": {
           "can_use_on_swarming_builders": true
         },
         "test": "native_theme_unittests"
       },
       {
         "swarming": {
@@ skipping 94 matching lines @@
       {
         "swarming": {
           "can_use_on_swarming_builders": true
         },
         "test": "ui_base_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"
       },
       {
         "swarming": {
@@ skipping 1532 matching lines @@
     "additional_compile_targets": [
       "chrome_official_builder"
     ]
   },
   "Win8 GYP (dbg)": {
     "additional_compile_targets": [
       "all"
     ]
   }
 }