In builder config, change "is_try_bot" -> "is_try_builder".

third_party/WebKit/Tools/Scripts/webkitpy/common/config/builders.py

 # Copyright (c) 2016, Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 # copyright notice, this list of conditions and the following disclaimer
@@ skipping 62 matching lines @@
     },
     "WebKit Android (Nexus4)": {
         "port_name": "android",
         "specifiers": ['Android', 'Release']
     },
     # TODO(qyearsley): Update this set of builders when new builders
     # are set up for layout test try jobs. http://crbug.com/474273.
     "linux_chromium_rel_ng": {
         "port_name": "linux-precise",
         "specifiers": ['Precise', 'Release'],
-        "is_try_bot": True,
+        "is_try_builder": True,
     },
     "mac_chromium_rel_ng": {
         "port_name": "mac-mac10.9",
         "specifiers": ['Mac10.9', 'Release'],
-        "is_try_bot": True,
+        "is_try_builder": True,
     },
     "win_chromium_rel_ng": {
         "port_name": "win-win7",
         "specifiers": ['Win7', 'Release'],
-        "is_try_bot": True,
+        "is_try_builder": True,
     },
 }