sync: update OWNERS to reflect committers working on the project.

BUG=none
NOTRY=true

Review URL: https://codereview.chromium.org/129533004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243696 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 243696