Revert repo back to an upstream we control

The purpose of this is so that cros can roll out repo updates at our
own pace (including testing), rather than being at the mercy of android
project rolling something out that may break our setup.

BUG=chromium-os:24413

Review URL: http://codereview.chromium.org/9021045

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@115533 0039d316-1c4b-4281-b951-d872f2087c98

repo

@@ -2,7 +2,7 @@
 
 ## repo default configuration
 ##
-REPO_URL='https://code.google.com/p/git-repo/'
+REPO_URL='https://git.chromium.org/git/external/repo'
 REPO_REV='stable'
 
 # Copyright (C) 2008 Google Inc.