Until r200514 is merged into every active branches on Windows, python can't be
upgraded to 2.7.x.

TBR=iannucci@chromium.org,joi@chromium.org
BUG=241769

Review URL: https://codereview.chromium.org/15294005

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@200800 0039d316-1c4b-4281-b951-d872f2087c98