Update presubmit files to send windows tryjobs to swarming bots, now that the CQ has switched over.

PRESUBMIT.py

Index: PRESUBMIT.py
diff --git a/PRESUBMIT.py b/PRESUBMIT.py
index 392d1d5b0fa4fa0b5f736b63691c8a56c04e36a3..ec9611d2650755e069d769bae7c87023df5f4d9e 100644
--- a/PRESUBMIT.py
+++ b/PRESUBMIT.py
@@ -1524,7 +1524,7 @@ def GetDefaultTryConfigs(bots=None):
       'mac_nacl_sdk_build': ['compile'],
       'win_chromium_compile_dbg': ['defaulttests'],
       'win_chromium_dbg': ['defaulttests'],
-      'win_chromium_rel': ['defaulttests'],
+      'win_chromium_rel_swarming': ['defaulttests'],
       'win_chromium_x64_rel': ['defaulttests'],
       'win_gpu': ['defaulttests'],
       'win_nacl_sdk_build': ['compile'],
@@ -1577,7 +1577,10 @@ def GetPreferredTryMasters(project, change):
         'mac_chromium_rel_swarming',
     ])
   if all(re.search('(^|[/_])win[/_.]', f) for f in files):
-    return GetDefaultTryConfigs(['win_chromium_dbg', 'win_chromium_rel'])
+    return GetDefaultTryConfigs([
+        'win_chromium_dbg',
+        'win_chromium_rel_swarming',
+    ])
   if all(re.search('(^|[/_])android[/_.]', f) for f in files):
     return GetDefaultTryConfigs([
         'android_aosp',
@@ -1602,7 +1605,7 @@ def GetPreferredTryMasters(project, change):
       'mac_chromium_rel_swarming',
       'mac_gpu',
       'win_chromium_compile_dbg',
-      'win_chromium_rel',
+      'win_chromium_rel_swarming',
       'win_chromium_x64_rel',
       'win_gpu',
   ]