Works on linux in addition to OS X now.

TBR=agable@chromium.org
BUG=

Review URL: https://codereview.chromium.org/234733003

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@263292 0039d316-1c4b-4281-b951-d872f2087c98