Remove myself from webkit/OWNERS.

I'm not actively working on Chromium.

TBR=darin

Review URL: https://codereview.chromium.org/143003008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246102 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 246102