MD Settings: Preserve search URL param in subpages.

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

 // Copyright 2016 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 tests for the settings menu. */
 
 cr.define('settings_menu', function() {
   function registerSettingsMenuTest() {
     var settingsMenu = null;
 
@@ skipping 49 matching lines @@
         Polymer.dom.flush();
         assertNotEquals(openIcon, ironIconElement.icon);
       });
 
       test('openResetSection', function() {
         settingsMenu.currentRoute = settings.Route.RESET;
         var advancedPage = settingsMenu.$.advancedPage;
         assertEquals('/reset',
             advancedPage.querySelector('paper-menu').selected);
       });
+
+      // Test that navigating via the paper menu always clears the current
+      // search URL parameter.
+      test('clearsUrlSearchParam', function() {
+        var urlParams = new URLSearchParams('search=foo');
+        settings.navigateTo(settings.Route.BASIC, urlParams);
+        assertEquals(
+            urlParams.toString(),
+            settings.getQueryParameters().toString());
+        MockInteractions.tap(settingsMenu.$.people);
+        assertEquals('', settings.getQueryParameters().toString());
+      });
     });
   }
 
   return {
     registerTests: function() {
       registerSettingsMenuTest();
     },
   };
 });