Fix buildbot_globals.py: Retrieve the file from our repo mirror

BUG=skia:2480
NOTRY=true
R=epoger@google.com

Author: borenet@google.com

Review URL: https://codereview.chromium.org/254013003

git-svn-id: http://skia.googlecode.com/svn/trunk@14439 2bbb7eff-a529-9590-31e7-b0007b416f81
1 file changed