Fix typos in OWNERS files

NOTRY=true

Review URL: https://codereview.chromium.org/299313004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@272738 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/extensions/api/cast_channel/OWNERS

 mfoltz@chromium.org
 munjal@chromium.org
-wez@chromium.com
+wez@chromium.org

chrome/browser/resources/hangout_services/OWNERS

 bemasc@chromium.org
-vrk@chrmium.org
+vrk@chromium.org