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

masters/master.tryserver.chromium/slaves.cfg

Index: masters/master.tryserver.chromium/slaves.cfg
===================================================================
--- masters/master.tryserver.chromium/slaves.cfg	(revision 175544)
+++ masters/master.tryserver.chromium/slaves.cfg	(working copy)
@@ -383,11 +383,11 @@
       'bits': '64',
     } for number in range(521, 525)
   ]
-  ash_aura_slaves = [
+  win7_aura_slaves = [
     {
       'master': 'TryServer',
       'builder': [
-        'win_ash', 'win_aura',
+        'win7_aura',
         'win', 'win_rel_naclmore', 'win_rel'
       ],
       'hostname': 'vm%d-m4' % number,
@@ -396,6 +396,18 @@
       'bits': '64',
     } for number in new_win7
   ]
+  win8_aura_slaves = [
+    {
+      'master': 'TryServer',
+      'builder': [
+        'win8_aura',
+      ],
+      'hostname': 'vm115-m4',
+      'os': 'win',
+      'version': 'win8',
+      'bits': '64',
+    }
+  ]
   drmemory_slaves = [
     {
       'master': 'TryServer',
@@ -478,7 +490,8 @@
       normal_slaves +
       nacl_sdk_slaves +
       layout_slaves +
-      ash_aura_slaves +
+      win7_aura_slaves +
+      win8_aura_slaves +
       drmemory_slaves +
       chromeframe_slave +
       gpu_slaves +