This is rolling in https://codereview.chromium.org/1777003003

BUG=593420

Review URL: https://codereview.chromium.org/1785443002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@299187 0039d316-1c4b-4281-b951-d872f2087c98