This reverts commit 451939d5.

Throws an exception with a missing import, breaking Telemetry's
presubmit checks and presumably presubmit checks for all Python files
in Chromium. See comment on https://codereview.chromium.org/707353002/ .

BUG=chromium:431514

Review URL: https://codereview.chromium.org/719313003

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@292955 0039d316-1c4b-4281-b951-d872f2087c98