Remove kojih@ from WATCHLISTS

Koji isn't involved in Chromium any longer, so this just adds clutter
to CL CC lists.

R=haraken

Review URL: https://codereview.chromium.org/230013003

git-svn-id: svn://svn.chromium.org/blink/trunk@171124 bbb929c8-8fbe-4397-9dbb-9b2b20218538