Don't swarm interactive_ui_tests on Mac 10.10 since they're flaky when swarmed.

testing/buildbot/chromium.mac.json

 {
   "Mac GYP": {
     "additional_compile_targets": [
       "base_unittests",
       "browser_tests",
       "chrome",
       "content_browsertests",
       "content_unittests",
       "interactive_ui_tests",
       "ipc_tests",
@@ skipping 156 matching lines @@
         "test": "gpu_ipc_service_unittests"
       },
       {
         "swarming": {
           "can_use_on_swarming_builders": true
         },
         "test": "gpu_unittests"
       },
       {
         "swarming": {
-          "can_use_on_swarming_builders": true
+          "can_use_on_swarming_builders": false
         },
         "test": "interactive_ui_tests"
       },
       {
         "swarming": {
           "can_use_on_swarming_builders": true
         },
         "test": "ipc_tests"
       },
       {
@@ skipping 1189 matching lines @@
         "override_compile_targets": [
           "telemetry_unittests_run"
         ],
         "swarming": {
           "can_use_on_swarming_builders": true
         }
       }
     ]
   }
 }