GRIT rules improvements on windows

tools/grit/grit/format/rc_header.py

Index: tools/grit/grit/format/rc_header.py
diff --git a/tools/grit/grit/format/rc_header.py b/tools/grit/grit/format/rc_header.py
index 4da974acf069fe4b14b913921f0e09971bc5c577..849bf144831233691770f1a42f80a87060799090 100644
--- a/tools/grit/grit/format/rc_header.py
+++ b/tools/grit/grit/format/rc_header.py
@@ -7,7 +7,6 @@
 '''
 
 import re
-import time
 
 from grit.format import interface
 from grit import exception
@@ -26,10 +25,9 @@ class TopLevel(interface.ItemFormatter):
       header_string = '''// Copyright (c) Google Inc. %d
 // All rights reserved.
 // This file is automatically generated by GRIT. Do not edit.
-// Built on %s
 
 #pragma once
-''' % (util.GetCurrentYear(), time.asctime())
+''' % (util.GetCurrentYear())
       # Check for emit nodes under the rc_header. If any emit node
       # is present, we assume it means the GRD file wants to override
       # the default header, with no includes.