Make lists in the passwords section aware of the scroll target.

chrome/test/data/webui/settings/settings_passwords_section_browsertest.js

 // Copyright 2015 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.
 
 /** @fileoverview Runs the Polymer Password Settings tests. */
 
 /** @const {string} Path to root from chrome/test/data/webui/settings/. */
 var ROOT_PATH = '../../../../../';
 
 // Polymer BrowserTest fixture.
@@ skipping 92 matching lines @@
    * @param {!Array<!chrome.passwordsPrivate.PasswordUiEntry>} passwordList
    * @param {!Array<!chrome.passwordsPrivate.ExceptionPair>} exceptionList
    * @return {!Object}
    * @private
    */
   createPasswordsSection_: function(passwordList, exceptionList) {
     // Create a passwords-section to use for testing.
     var passwordsSection = document.createElement('passwords-section');
     passwordsSection.savedPasswords = passwordList;
     passwordsSection.passwordExceptions = exceptionList;
+    passwordsSection.scrollTarget = passwordsSection;
     document.body.appendChild(passwordsSection);
     this.flushPasswordSection_(passwordsSection);
     return passwordsSection;
   },
 
   /**
    * Helper method used to create a password editing dialog.
    * @param {!chrome.passwordsPrivate.PasswordUiEntry} passwordItem
    * @return {!Object}
    * @private
@@ skipping 319 matching lines @@
         assertEquals(item.loginPair.username, event.detail.username);
         done();
       });
 
       MockInteractions.tap(passwordDialog.$.showPasswordButton);
     });
   });
 
   mocha.run();
 });