WebRTC: Remove webrtc_perf_tests from trybots and Debug commit bots.

scripts/slave/recipes/webrtc/standalone.expected/tryserver_webrtc_mac_baremetal.json

 [
   {
     "cmd": [
       "RECIPE_PACKAGE_REPO[build]/scripts/slave/ios/host_info.py",
       "--json-file",
       "/path/to/tmp/json"
     ],
     "name": "host and tools info",
     "~followup_annotations": [
       "@@@STEP_TEXT@<br />OS X 1.2.3, Xcode 6.7.8 (5D342509a)@@@",
@@ skipping 297 matching lines @@
       "--step-name=video_capture_tests",
       "--builder-name=mac_baremetal",
       "--slave-name=slavename",
       "--build-number=1337",
       "--revision=f27fede2220bcd326aee3e86ddfd4ebd0fe58cb9",
       "video_capture_tests"
     ],
     "name": "video_capture_tests"
   },
   {
-    "allow_subannotations": true,
-    "cmd": [
-      "python",
-      "-u",
-      "RECIPE_PACKAGE_REPO[build]/scripts/slave/runtest.py",
-      "--target",
-      "Release",
-      "--factory-properties",
-      "{\"BUILD_CONFIG\": \"Release\", \"buildername\": \"mac_baremetal\", \"buildnumber\": 1337, \"issue\": 666666, \"mastername\": \"tryserver.webrtc\", \"patchset\": 1, \"recipe\": \"webrtc/standalone\", \"revision\": \"12345\", \"rietveld\": \"https://fake.rietveld.url\", \"slavename\": \"slavename\"}",
-      "--build-properties",
-      "{\"BUILD_CONFIG\": \"Release\", \"buildername\": \"mac_baremetal\", \"buildnumber\": 1337, \"issue\": 666666, \"mastername\": \"tryserver.webrtc\", \"patchset\": 1, \"recipe\": \"webrtc/standalone\", \"revision\": \"12345\", \"rietveld\": \"https://fake.rietveld.url\", \"slavename\": \"slavename\"}",
-      "--annotate=gtest",
-      "--test-type=webrtc_perf_tests",
-      "--step-name=webrtc_perf_tests",
-      "--builder-name=mac_baremetal",
-      "--slave-name=slavename",
-      "--build-number=1337",
-      "--revision=f27fede2220bcd326aee3e86ddfd4ebd0fe58cb9",
-      "webrtc_perf_tests"
-    ],
-    "name": "webrtc_perf_tests"
-  },
-  {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]