lib: remove unused modules

Some files in `lib` were using `require` to load modules that were subsequently not used in the file. This removes those `require` statements. PR-URL: #4683 Reviewed-By: Myles Borins <mborins@us.ibm.com>
nodejs · Jan 19, 2016 · 7a1a0a0 · 7a1a0a0
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diff --git a/lib/_http_client.js b/lib/_http_client.js
@@ -3,7 +3,6 @@
 const util = require('util');
 const net = require('net');
 const url = require('url');
-const EventEmitter = require('events');
 const HTTPParser = process.binding('http_parser').HTTPParser;
 const assert = require('assert').ok;
 const common = require('_http_common');

diff --git a/lib/os.js b/lib/os.js
@@ -1,7 +1,6 @@
 'use strict';
 
 const binding = process.binding('os');
-const util = require('util');
 const internalUtil = require('internal/util');
 const isWindows = process.platform === 'win32';