MD History: Use one-way binding for history query state.

chrome/test/data/webui/md_history/history_toolbar_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.
 
 suite('history-toolbar', function() {
   var app;
   var element;
   var toolbar;
   var TEST_HISTORY_RESULTS;
 
@@ skipping 57 matching lines @@
 
     toolbar.$$('cr-toolbar').fire('search-changed', 'Test2');
   });
 
   test('grouped history navigation buttons', function() {
     var info = createHistoryInfo();
     info.finished = false;
     app.historyResult(info, []);
     app.grouped_ = true;
     return PolymerTest.flushTasks().then(function() {
-      app.set('queryState_.range', HistoryRange.MONTH);
+      app.fire('change-query', {range: HistoryRange.MONTH});
       groupedList = app.$.history.$$('#grouped-list');
       assertTrue(!!groupedList);
       var today = toolbar.$$('#today-button');
       var next = toolbar.$$('#next-button');
       var prev = toolbar.$$('#prev-button');
 
       assertEquals(0, toolbar.groupedOffset);
       assertTrue(today.disabled);
       assertTrue(next.disabled);
       assertFalse(prev.disabled);
 
       MockInteractions.tap(prev);
       assertEquals(1, toolbar.groupedOffset);
       assertFalse(today.disabled);
       assertFalse(next.disabled);
       assertFalse(prev.disabled);
 
       app.historyResult(createHistoryInfo(), []);
       assertFalse(today.disabled);
       assertFalse(next.disabled);
       assertTrue(prev.disabled);
     });
   });
 
   teardown(function() {
     registerMessageCallback('queryHistory', this, function() {});
   });
 });