See also https://codereview.chromium.org/720033003/

BUG=311488,432748

Review URL: https://codereview.chromium.org/719343004

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@292950 0039d316-1c4b-4281-b951-d872f2087c98