diff --git a/tools_webrtc/mb/gn_isolate_map.pyl b/tools_webrtc/mb/gn_isolate_map.pyl
deleted file mode 100644
index 02e84788e9..0000000000
--- a/tools_webrtc/mb/gn_isolate_map.pyl
+++ /dev/null
@@ -1,147 +0,0 @@
-# Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
-#
-# Use of this source code is governed by a BSD-style license
-# that can be found in the LICENSE file in the root of the source
-# tree. An additional intellectual property rights grant can be found
-# in the file PATENTS.  All contributing project authors may
-# be found in the AUTHORS file in the root of the source tree.
-
-# gn_isolate_map.pyl - A mapping of Ninja build target names to GN labels and
-# test type classifications for the tests that are run on the bots.
-#
-# This file is based on testing/buildbot/gn_isolate_map.pyl for Chromium, but
-# is covering WebRTC stand-alone tests instead.
-# See https://cs.chromium.org/chromium/src/testing/buildbot/gn_isolate_map.pyl
-# for more detailed documentation.
-
-{
-  "All": {
-    "label": "//:All",
-    "type": "additional_compile_target",
-  },
-  "AppRTCMobile_test_apk": {
-    "label": "//examples:AppRTCMobile_test_apk",
-    "type": "console_test_launcher",
-  },
-  "android_junit_tests": {
-    "label": "//:android_junit_tests",
-    "type": "junit_test",
-  },
-  "android_examples_junit_tests": {
-    "label": "//examples:android_examples_junit_tests",
-    "type": "junit_test",
-  },
-  "android_sdk_junit_tests": {
-    "label": "//sdk/android:android_sdk_junit_tests",
-    "type": "junit_test",
-  },
-  "apprtcmobile_tests": {
-    "label": "//examples:apprtcmobile_tests",
-    "type": "console_test_launcher",
-  },
-  "audio_decoder_unittests": {
-    "label": "//modules/audio_coding:audio_decoder_unittests",
-    "type": "console_test_launcher",
-  },
-  "common_audio_unittests": {
-    "label": "//common_audio:common_audio_unittests",
-    "type": "console_test_launcher",
-  },
-  "common_video_unittests": {
-    "label": "//common_video:common_video_unittests",
-    "type": "console_test_launcher",
-  },
-  "dcsctp_unittests": {
-    "label": "//net/dcsctp:dcsctp_unittests",
-    "type": "console_test_launcher",
-  },
-  "android_instrumentation_test_apk": {
-    "label": "//sdk/android:android_instrumentation_test_apk",
-    "type": "console_test_launcher",
-  },
-  "low_bandwidth_audio_test": {
-    "label": "//audio:low_bandwidth_audio_test",
-    "type": "console_test_launcher",
-    "args": [
-      "--quick",
-    ],
-  },
-  "low_bandwidth_audio_perf_test": {
-    "label": "//audio:low_bandwidth_audio_perf_test",
-    "type": "script",
-    "script": "//audio/test/low_bandwidth_audio_test.py",
-    "args": [
-      ".", "--remove",
-    ],
-  },
-  "modules_tests": {
-    "label": "//modules:modules_tests",
-    "type": "console_test_launcher",
-  },
-  "modules_unittests": {
-    "label": "//modules:modules_unittests",
-    "type": "windowed_test_launcher",
-  },
-  "peerconnection_unittests": {
-    "label": "//pc:peerconnection_unittests",
-    "type": "console_test_launcher",
-  },
-  "rtc_media_unittests": {
-    "label": "//media:rtc_media_unittests",
-    "type": "console_test_launcher",
-  },
-  "rtc_pc_unittests": {
-    "label": "//pc:rtc_pc_unittests",
-    "type": "console_test_launcher",
-  },
-  "rtc_stats_unittests": {
-    "label": "//stats:rtc_stats_unittests",
-    "type": "console_test_launcher",
-  },
-  "rtc_unittests": {
-    "label": "//:rtc_unittests",
-    "type": "console_test_launcher",
-  },
-  "sdk_framework_unittests": {
-    "label": "//sdk:sdk_framework_unittests",
-    "type": "console_test_launcher",
-  },
-  "sdk_unittests": {
-    "label": "//sdk:sdk_unittests",
-    "type": "console_test_launcher",
-  },
-  "system_wrappers_unittests": {
-    "label": "//system_wrappers:system_wrappers_unittests",
-    "type": "console_test_launcher",
-  },
-  "test_support_unittests": {
-    "label": "//test:test_support_unittests",
-    "type": "console_test_launcher",
-  },
-  "tools_unittests": {
-    "label": "//rtc_tools:tools_unittests",
-    "type": "console_test_launcher",
-  },
-  "video_capture_tests": {
-    "label": "//modules/video_capture:video_capture_tests",
-    "type": "non_parallel_console_test_launcher",
-    # TODO(bugs.webrtc.org/9292): remove use_webcam and the ensure script.
-    "use_webcam": True,
-  },
-  "video_engine_tests": {
-    "label": "//:video_engine_tests",
-    "type": "console_test_launcher",
-  },
-  "voip_unittests": {
-    "label": "//:voip_unittests",
-    "type": "console_test_launcher",
-  },
-  "webrtc_nonparallel_tests": {
-    "label": "//:webrtc_nonparallel_tests",
-    "type": "non_parallel_console_test_launcher",
-  },
-  "webrtc_perf_tests": {
-    "label": "//:webrtc_perf_tests",
-    "type": "raw",
-  },
-}
diff --git a/tools_webrtc/mb/mb.py b/tools_webrtc/mb/mb.py
index bfc7adca5c..1a375e1a4c 100755
--- a/tools_webrtc/mb/mb.py
+++ b/tools_webrtc/mb/mb.py
@@ -44,7 +44,8 @@ class WebRTCMetaBuildWrapper(mb.MetaBuildWrapper):
     assert self.default_config
     assert self.default_isolate_map
     self.default_config = os.path.join(_SCRIPT_DIR, 'mb_config.pyl')
-    self.default_isolate_map = os.path.join(_SCRIPT_DIR, 'gn_isolate_map.pyl')
+    self.default_isolate_map = os.path.join(_SRC_DIR, 'infra', 'specs',
+                                            'gn_isolate_map.pyl')
 
   def GetSwarmingCommand(self, target, vals):
     isolate_map = self.ReadIsolateMap()