Remove GYP builders from chromium mac, win waterfalls.

masters/master.chromium.mac/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 56 matching lines @@
     'os': 'mac',
     'version': '10.9',
   },
   {
     'master': 'ChromiumMac',
     'hostname': 'vm618-m1',
     'builder': 'ios-simulator',
     'os': 'mac',
     'version': '10.9',
   },
-  {
-    'master': 'ChromiumMac',
-    'hostname': 'vm18-m1',
-    'builder': 'ios-device-gn',
-    'os': 'mac',
-    'version': '10.9',
-  },
-  {
-    'master': 'ChromiumMac',
-    'hostname': 'vm21-m1',
-    'builder': 'ios-simulator-gn',
-    'os': 'mac',
-    'version': '10.9',
-  },
-  {
-    'master': 'ChromiumMac',
-    'hostname': 'vm617-m1',
-    'builder': ['Mac GYP', 'Mac GYP (dbg)'],
-    'os': 'mac',
-    'version': '10.9',
-    'bits': '64',
-  }
 ]