Add win8 aura bot to chromium.win, make tryserver match

masters/master.chromium.win/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 292 matching lines @@
   {
     'master': 'ChromiumWin',
     'builder': 'Win7 Sync',
     'hostname': 'vm803-m1',
     'os': 'win',
     'version': 'win7',
     'bits': '64',
   },
   {
     'master': 'ChromiumWin',
     'builder': 'Win Aura',

[Peter Mayo, 2012/12/17 21:23:48]

'builder': ['Win Aura Builder', 'Win Aura',], 

or allocate another slave

[scottmg, 2012/12/17 22:00:40]

Done.

     'hostname': 'build10-m1',
     'os': 'win',
     'version': '2008',
     'bits': '64',
   },
+  {
+    'master': 'ChromiumWin',
+    'builder': 'Win8 Ash',
+    'hostname': 'vm898-m1',
+    'os': 'win',
+    'version': 'win8',
+    'bits': '64',
+  },
 ]