Revert of Run Mojo apptests step on Windows main and cq bots.

testing/buildbot/chromium.win.json

 {
   "Vista Tests (1)": {
     "gtest_tests": [
       {
         "swarming": {
           "can_use_on_swarming_builders": true
         },
         "test": "accessibility_unittests"
       },
       {
@@ skipping 1558 matching lines @@
       },
       {
         "test": "resource_provider_unittests"
       },
       {
         "test": "ui_touch_selection_unittests"
       },
       {
         "test": "window_manager_unittests"
       }
-    ],
-    "scripts": [
-      {
-        "name": "mojo_apptests",
-        "script": "mojo_apptests.py"
-      }
     ]
   },
   "Win8 GN": {
     "additional_compile_targets": [
       "accessibility_unittests",
       "app_list_unittests",
       "app_shell_unittests",
       "ash_unittests",
       "aura_unittests",
       "cacheinvalidation_unittests",
@@ skipping 409 matching lines @@
         "name": "telemetry_perf_unittests",
         "script": "telemetry_perf_unittests.py"
       },
       {
         "name": "nacl_integration",
         "script": "nacl_integration.py"
       }
     ]
   }
 }