Add zmo and kbr as content/browser/resources owners

BUG=
TEST=
R=nduca@chromium.org

Review URL: https://codereview.chromium.org/173883008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@252549 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 252549