Remove XP and Vista bots from chromium.win and chromium.webkit waterfalls.

masters/master.chromium.webkit/slaves.cfg

 # 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.
 
 slaves = [
 ################################################################################
 ### WebKit Win Latest
 ################################################################################
   {
     'master': 'ChromiumWebkit',
     'builder': ['WebKit Win Builder',
                 'WebKit Win Builder (dbg)'],
     'hostname': 'build65-m1',
     'os': 'win',
     'version': '2008',
     'bits': '64',
   },
   {
     'master': 'ChromiumWebkit',
-    'builder': 'WebKit XP',
-    'hostname': 'vm479-m1',
-    'os': 'win',
-    'version': 'xp',
-    'bits': '32',
-  },
-  {
-    'master': 'ChromiumWebkit',
     'builder': 'WebKit Win7',
     'hostname': 'vm834-m1',
     'os': 'win',
     'version': 'win7',
     'bits':  '64',
   },
   {
     'master': 'ChromiumWebkit',
     'builder': 'WebKit Win7 (dbg)',
     'hostname': 'vm948-m1',
@@ skipping 244 matching lines @@
   },
   {
     'master': 'ChromiumWebkit',
     'hostname': 'build132-a1',
     'builder': 'WebKit Android (Nexus4)',
     'os': 'linux',
     'version': 'precise',
     'bits': '64',
   },
 ]