Make blink_trybot recipe work on windows

scripts/slave/recipe_configs_util.py

 # Copyright 2013 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.
 
 """Recipe Configuration Meta DSL.
 
 This module contains, essentially, a DSL for writing composable configurations.
 You start by defining a schema which describes how your configuration blobs will
 be structured, and what data they can contain. For example:
 
@@ skipping 355 matching lines @@
   def set_val(self, val):
     if isinstance(val, ConfigBase):
       val = val.as_jsonish(include_hidden=True)
     assert isinstance(val, dict)
     for name, config_obj in self._type_map.iteritems():
       if name in val:
         config_obj.set_val(val.pop())
     assert not val, "Got extra keys while setting ConfigGroup: %s" % val
 
   def as_jsonish(self, include_hidden=False):
-    return {
-      n: v.as_jsonish(include_hidden) for n, v in self._type_map.iteritems()
-        if (include_hidden or not v._hidden)}  # pylint: disable=W0212
+    return dict(
+      (n, v.as_jsonish(include_hidden)) for n, v in self._type_map.iteritems()
+        if (include_hidden or not v._hidden))  # pylint: disable=W0212
 
   def reset(self):
     for v in self._type_map.values():
       v.reset()
 
   def complete(self):
     return all(v.complete() for v in self._type_map.values())
 
 
 class ConfigList(ConfigBase, collections.MutableSequence):
@@ skipping 286 matching lines @@
     assert False
 
   def as_jsonish(self, _include_hidden=None):
     assert False
 
   def reset(self):
     assert False
 
   def complete(self):
     return True