Add raymes@ and benwells@ as c/b/geolocation owners.

This code is mostly permissions related, and most changes related to the
handling of permissions and content settings.

BUG=None

Review-Url: https://codereview.chromium.org/2627323004
Cr-Commit-Position: refs/heads/master@{#443532}

chrome/browser/geolocation/OWNERS

+benwells@chromium.org
 mvanouwerkerk@chromium.org
+raymes@chromium.org
 timvolodine@chromium.org