Clean up BUILD gn target of telemetry_perf_unittests, telemetry_gpu_unittests,

testing/buildbot/chromium.win.json

 {
   "Vista Tests (1)": {
     "gtest_tests": [
       {
         "swarming": {
           "can_use_on_swarming_builders": true
         },
         "test": "accessibility_unittests"
       },
       {
@@ skipping 2003 matching lines @@
         "override_compile_targets": [
           "telemetry_gpu_unittests_run"
         ],
         "swarming": {
           "can_use_on_swarming_builders": true
         }
       }
     ],
     "scripts": [
       {
-        "name": "telemetry_perf_unittests",
-        "script": "telemetry_perf_unittests.py"
-      },
-      {
         "name": "nacl_integration",
         "script": "nacl_integration.py"
       }
     ]
   }
 }