refactor: replace import of URL class with global reference (nodejs#1455)

Author: Fdawgs

lib/proxy-agent.js

@@ -1,7 +1,6 @@
 'use strict'
 
 const { kProxy, kClose, kDestroy } = require('./core/symbols')
-const { URL } = require('url')
 const Agent = require('./agent')
 const DispatcherBase = require('./dispatcher-base')
 const { InvalidArgumentError } = require('./core/errors')

test/fetch/blob-uri.js

@@ -2,7 +2,6 @@
 
 const { test } = require('tap')
 const { fetch } = require('../..')
-const { URL } = require('url')
 const { Blob } = require('buffer')
 
 test('fetching blob: uris', async (t) => {

test/fetch/request.js

@@ -8,7 +8,6 @@ const {
   Headers
 } = require('../../')
 const { kState } = require('../../lib/fetch/symbols.js')
-const { URLSearchParams } = require('url')
 
 test('arg validation', (t) => {
   // constructor

test/proxy-agent.js

@@ -2,7 +2,6 @@
 
 const { test } = require('tap')
 const { request, setGlobalDispatcher, getGlobalDispatcher } = require('..')
-const { URL } = require('url')
 const { InvalidArgumentError } = require('../lib/core/errors')
 const ProxyAgent = require('../lib/proxy-agent')
 const { createServer } = require('http')