Fix gclient revinfo

Review URL: http://codereview.chromium.org/2380001

Change-Id: Icfef43fe507be04b8c178440834d26b9ac3ced77

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@48489 0039d316-1c4b-4281-b951-d872f2087c98

gclient.py

@@ -1043,6 +1043,7 @@ def CMDrevinfo(parser, args):
                          "version of all repositories")
   (options, args) = parser.parse_args(args)
   client = GClient.LoadCurrentConfig(options)
+  options.deps_os = None
   if not client:
     raise gclient_utils.Error("client not configured; see 'gclient config'")
   client.PrintRevInfo()