chrome.webRequest.*.removeListener removes callbacks that were registered multiple times

chrome/test/data/extensions/api_test/webrequest/test_api.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.
 
 chrome.test.runTests([
   function addListeners() {
     chrome.webRequest.onBeforeRequest.addListener(
         function(details) {}, {urls: ["<all_urls>"]});
     chrome.webRequest.onBeforeSendHeaders.addListener(
         function(details) {}, {urls: ["<all_urls>"]});
@@ skipping 26 matching lines @@
     event.addListener(cb1, {urls: ["<all_urls>"]});
     event.addListener(cb2, {urls: ["<all_urls>"]});
     chrome.test.assertTrue(event.hasListener(cb1));
     chrome.test.assertTrue(event.hasListener(cb2));
     event.removeListener(cb1);
     chrome.test.assertFalse(event.hasListener(cb1));
     chrome.test.assertTrue(event.hasListener(cb2));
     event.removeListener(cb2);
     chrome.test.assertFalse(event.hasListener(cb1));
     chrome.test.assertFalse(event.hasListener(cb2));
+    event.addListener(cb1, {urls: ["http://foo/*"]});
+    event.addListener(cb1, {urls: ["http://bar/*"]});
+    event.removeListener(cb1);
+    chrome.test.assertFalse(event.hasListener(cb1));
     chrome.test.succeed();
   },
 
   // Tests that the extra parameters to addListener are checked for invalid
   // values.
   function specialEvents() {
     var goodFilter = {urls: ["http://*.google.com/*"]};
     var goodExtraInfo = ["blocking"];
     chrome.webRequest.onBeforeRequest.addListener(
         function(details) {},
@@ skipping 52 matching lines @@
     var emptyCallback = function (details) {};
     chrome.webRequest.onBeforeRequest.addListener(
         emptyCallback,
         {urls: ["badpattern://*"]});
     chrome.webRequest.onBeforeRequest.removeListener(
         emptyCallback);
 
     chrome.test.succeed();
   },
 ]);