Removed tryserver.chromium.gpu and related references

tests/masters_test.py

 #!/usr/bin/env python
 # Copyright 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Starts all masters and verify they can server /json/project fine.
 """
 
 import collections
 import contextlib
@@ skipping 241 matching lines @@
       'master.client.syzygy': 'Syzygy',
       'master.client.v8': 'V8',
       'master.client.v8.branches': 'V8Branches',
       'master.client.webrtc': 'WebRTC',
       'master.client.webrtc.fyi': 'WebRTCFYI',
       'master.experimental': 'Experimental',
       'master.push.canary': 'PushCanary',
       'master.tryserver.chromium.linux': 'TryServerChromiumLinux',
       'master.tryserver.chromium.mac': 'TryServerChromiumMac',
       'master.tryserver.chromium.win': 'TryServerChromiumWin',
-      'master.tryserver.chromium.gpu': 'GpuTryServer',
       'master.tryserver.chromium.perf': 'ChromiumPerfTryServer',
       'master.tryserver.client.mojo': 'MojoTryServer',
       'master.tryserver.blink': 'BlinkTryServer',
       'master.tryserver.libyuv': 'LibyuvTryServer',
       'master.tryserver.nacl': 'NativeClientTryServer',
       'master.tryserver.v8': 'V8TryServer',
       'master.tryserver.webrtc': 'WebRTCTryServer',
   }
   all_masters = {base_dir: public_masters}
   if os.path.exists(build_internal):
     internal_test_data = chromium_utils.ParsePythonCfg(
         os.path.join(build_internal, 'tests', 'internal_masters_cfg.py'),
         fail_hard=True)
     all_masters[build_internal] = internal_test_data['masters_test']
   return real_main(all_masters)
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))