Its side-effect caused tree breakages, at least on the try slaves.

TBR=dpranke
BUG=none
TEST=none

Review URL: http://codereview.chromium.org/251095

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@28058 0039d316-1c4b-4281-b951-d872f2087c98