WebRTC: Remove webrtc_perf_tests from trybots and Debug commit bots.

scripts/slave/recipes/webrtc/standalone.expected/tryserver_webrtc_android_n6.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--master",
       "tryserver.webrtc",
       "--builder",
       "android_n6",
@@ skipping 562 matching lines @@
     "env": {
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json",
       "PATH": "[SLAVE_BUILD]/src/third_party/android_tools/sdk/platform-tools:[SLAVE_BUILD]/src/build/android:%(PATH)s"
     },
     "name": "webrtc_nonparallel_tests"
   },
   {
     "cmd": [
       "python",
       "-u",
-      "[SLAVE_BUILD]/src/out/Debug/bin/run_webrtc_perf_tests",
-      "--blacklist-file",
-      "[SLAVE_BUILD]/src/out/bad_devices.json",
-      "--verbose"
-    ],
-    "env": {
-      "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json",
-      "PATH": "[SLAVE_BUILD]/src/third_party/android_tools/sdk/platform-tools:[SLAVE_BUILD]/src/build/android:%(PATH)s"
-    },
-    "name": "webrtc_perf_tests"
-  },
-  {
-    "cmd": [
-      "python",
-      "-u",
       "[SLAVE_BUILD]/src/out/Debug/bin/run_AppRTCDemoTest",
       "--blacklist-file",
       "[SLAVE_BUILD]/src/out/bad_devices.json",
       "--verbose"
     ],
     "name": "Instrumentation test AppRTCDemoTest"
   },
   {
     "cmd": [
       "python",
@@ skipping 69 matching lines @@
       "@@@STEP_LOG_LINE@python.inline@  os.remove(report)@@@",
       "@@@STEP_LOG_END@python.inline@@@"
     ]
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]