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

masters/master.tryserver.chromium/master.cfg

Index: masters/master.tryserver.chromium/master.cfg
===================================================================
--- masters/master.tryserver.chromium/master.cfg	(revision 175544)
+++ masters/master.tryserver.chromium/master.cfg	(working copy)
@@ -1297,10 +1297,10 @@
                           ' component=shared_library')}})
 }
 
-b_win_aura = CreateBuilder(
+b_win7_aura = CreateBuilder(
     platform='win32',
     target='Debug',
-    builder_name='win_aura',
+    builder_name='win7_aura',
     options=['aura_builder'],
     tests=[
       'ash_unittests',
@@ -1323,10 +1323,10 @@
     })
 
 # this matches the bot on the main waterfall soon
-b_win_ash = CreateBuilder(
+b_win8_aura = CreateBuilder(
     platform='win32',
     target='Debug',
-    builder_name='win_ash',
+    builder_name='win8_aura',
     options=['aura_builder'],
     tests=[
       'ash_unittests',
@@ -1337,7 +1337,7 @@
     goma=True,
     factory_properties={
       'gclient_env': {
-        'GYP_DEFINES': 'use_ash=1',
+        'GYP_DEFINES': 'use_aura=1',
       },
     })
 
@@ -1789,7 +1789,7 @@
   b_win_chrome_frame,
   b_swarm,
   b_linux_chromeos_clang,
-  b_linux_futura, b_linux_aura, b_win_ash, b_win_aura,
+  b_linux_futura, b_linux_aura, b_win7_aura, b_win8_aura,
   b_linux_asan,
   b_linux_chromeos_asan,
   b_mac_asan,