Remove the Win GN bots from the FYI waterfall.

masters/master.chromium.fyi/slaves.cfg

 # -*- python -*-
 # ex: set syntax=python:
 
 # Copyright (c) 2012 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.
 
 # See master.experimental/slaves.cfg for documentation.
 
 
@@ skipping 724 matching lines @@
   {
     'master': 'ChromiumFYI',
     'builder': 'Chromium Win MiniInstaller Tests',
     'hostname': 'vm950-m1',
     'os': 'win',
     'version': 'win7',
     'bits': '64',
   },
   {
     'master': 'ChromiumFYI',
-    'builder': 'Windows GN',
-    'hostname': 'build20-a1',
-    'os': 'win',
-    'version': 'win8',
-    'bits': '64',
-  },
-  {
-    'master': 'ChromiumFYI',
-    'builder': 'Windows GN (dbg)',
-    'hostname': 'build21-a1',
-    'os': 'win',
-    'version': 'win8',
-    'bits': '64',
-  },
-  {
-    'master': 'ChromiumFYI',
     'builder': [
       'Android Cronet Builder',
       'Android Cronet ARMv6 Builder',
       'Android Cronet x86 Builder',
       'Android Cronet MIPS Builder',
       'Android Cronet Builder (dbg)'
     ],
     'hostname': 'build29-a1',
     'os': 'linux',
     'version': 'precise',
@@ skipping 122 matching lines @@
   },
   {
     'master': 'ChromiumFYI',
     'builder': 'Linux ChromiumOS Athena Tests (1)',
     'hostname': 'vm869-m1',
     'os': 'linux',
     'version': 'precise',
     'bits': '64',
   }
 ]