Removing Dummy Test Suit - webkit_compositor_bindings_unittests

testing/buildbot/chromium_trybot.json

 {
   "compile_targets": [
     "all"
   ],
   "gtest_tests": [
     "accessibility_unittests",
     "app_list_unittests",
     {
       "test": "base_unittests",
       "swarming": {
@@ skipping 98 matching lines @@
     "sync_unit_tests",
     "ui_unittests",
     {
       "test": "unit_tests",
       "swarming": {
         "can_use_on_swarming_builders": true,
         "shards": 2
       }
     },
     "url_unittests",
-    "webkit_compositor_bindings_unittests",
     {
       "test": "wm_unittests",
       "platforms": ["linux"]
     },
     {
       "test": "app_shell_browsertests",
       "platforms": ["linux"]
     },
     {
       "test": "ash_unittests",
@@ skipping 33 matching lines @@
       "test": "athena_unittests",
       "platforms": ["linux"],
       "chromium_configs": ["chromium_chromeos", "chromium_chromeos_clang"]
     },
     {
       "test": "display_unittests",
       "platforms": ["linux"]
     }
   ]
 }