lib: remove double check of string type

checkIsHttpToken() already checks for typeof string. We do not
want to check twice.

PR-URL: #7985
Reviewed-By: Ben Noordhuis <[email protected]>
Reviewed-By: Anna Henningsen <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Johan Bergström <[email protected]>
Reviewed-By: Brian White <[email protected]>
Reviewed-By: James M Snell <[email protected]>

Author: fhinkel

lib/_http_outgoing.js

@@ -338,8 +338,6 @@ OutgoingMessage.prototype.setHeader = function(name, value) {
   if (!common._checkIsHttpToken(name))
     throw new TypeError(
       'Header name must be a valid HTTP Token ["' + name + '"]');
-  if (typeof name !== 'string')
-    throw new TypeError('"name" should be a string in setHeader(name, value)');
   if (value === undefined)
     throw new Error('"value" required in setHeader("' + name + '", value)');
   if (this._header)