Revert "dns: validate arguments in resolve"

This reverts commit 56e80a37e0.

lib/dns.js

@@ -146,11 +146,6 @@ function resolver(bindingName) {
       if (!status) {
         callback(null, result);
       } else {
-        if (!util.isString(name))
-          throw new Error('Name must be a string')
-        else if (!util.isFunction(callback))
-          throw new Error('Callback must be a function')
-
         callback(errnoException(process._errno, bindingName));
       }
     }

test/simple/test-dns-regress-7070.js

@@ -1,27 +0,0 @@
-// Copyright Joyent, Inc. and other Node contributors.
-//
-// Permission is hereby granted, free of charge, to any person obtaining a
-// copy of this software and associated documentation files (the
-// "Software"), to deal in the Software without restriction, including
-// without limitation the rights to use, copy, modify, merge, publish,
-// distribute, sublicense, and/or sell copies of the Software, and to permit
-// persons to whom the Software is furnished to do so, subject to the
-// following conditions:
-//
-// The above copyright notice and this permission notice shall be included
-// in all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
-// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
-// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
-// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
-// USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-var common = require('../common');
-var dns = require('dns');
-
-// Should not raise assertion error. Issue #7070
-assert.throws(function () { dns.resolveNs([]) }); // bad name
-assert.throws(function () { dns.resolveNs("") }); // bad callback