Noticed by Jens Widell in https://codereview.chromium.org/932333003/

TBR=maruel

BUG=459855

Review URL: https://codereview.chromium.org/933373004

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@294123 0039d316-1c4b-4281-b951-d872f2087c98