Remove unsused and poorly named groups.getGroups() API

src/groupdb.js

@@ -20,8 +20,6 @@ exports = module.exports = {
     getMembership: getMembership,
     setMembership: setMembership,
 
-    getGroups: getGroups,
-
     _clear: clear
 };
 
@@ -274,15 +272,3 @@ function isMember(groupId, userId, callback) {
         callback(null, result.length !== 0);
     });
 }
-
-function getGroups(userId, callback) {
-    assert.strictEqual(typeof userId, 'string');
-    assert.strictEqual(typeof callback, 'function');
-
-    database.query('SELECT ' + GROUPS_FIELDS + ' ' +
-        ' FROM userGroups INNER JOIN groupMembers ON userGroups.id = groupMembers.groupId AND groupMembers.userId = ?', [ userId ], function (error, results) {
-        if (error) return callback(new BoxError(BoxError.DATABASE_ERROR, error));
-
-        callback(null, results);
-    });
-}