Refactor: Extract "InitProxyResolver" to "ProxyScriptDecider".

chrome/test/data/extensions/api_test/proxy/events/parse_error.js

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // proxy api test
 // browser_tests.exe --gtest_filter=ProxySettingsApiTest.ProxyEventsParseError
 
 var expected_error = {
     error: "net::ERR_PAC_SCRIPT_FAILED",
     details: "line: 1: Uncaught SyntaxError: Unexpected token !",
     fatal: false
 };
 
 function test() {
   // Install error handler and get the test server config.
   chrome.proxy.onProxyError.addListener(function (error) {
     chrome.test.assertEq(expected_error, error);
     chrome.test.notifyPass();
   });
 
   // Set an invalid PAC script. This should trigger a proxy errors.
   var config = {
     mode: "pac_script",
     pacScript: {
-      data: "trash!",
+      data: "trash!-FindProxyForURL",
       mandatory: false
     }
   };
   chrome.proxy.settings.set({'value': config}, testDone);
 }
 
 function testDone() {
  // Do nothing. The test success/failure is decided in the event handler.
 }
 
 test();