Remove stale git_cl directory.

It was kept to easy the transition but it's been a while now.

[email protected]
BUG=
TEST=


Review URL: http://codereview.chromium.org/8056005

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@102924 0039d316-1c4b-4281-b951-d872f2087c98

Author: [email protected]