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

chrome/test/data/webui/md_history/history_metrics_test.js

Index: chrome/test/data/webui/md_history/history_metrics_test.js
diff --git a/chrome/test/data/webui/md_history/history_metrics_test.js b/chrome/test/data/webui/md_history/history_metrics_test.js
index a708454b026dc3e3e3ad3298b2e784dd47830f20..c065ac10f90b5eadc0b8644016fda6a077c7f2f1 100644
--- a/chrome/test/data/webui/md_history/history_metrics_test.js
+++ b/chrome/test/data/webui/md_history/history_metrics_test.js
@@ -76,9 +76,9 @@ suite('Metrics', function() {
       assertEquals(1, histogram[HistoryPageViewHistogram.SYNCED_TABS]);
       app.selectedPage_ = 'history';
       assertEquals(2, histogram[HistoryPageViewHistogram.HISTORY]);
-      app.set('queryState_.range', HistoryRange.WEEK);
+      app.fire('change-query', {range: HistoryRange.WEEK});
       assertEquals(1, histogram[HistoryPageViewHistogram.GROUPED_WEEK]);
-      app.set('queryState_.range', HistoryRange.MONTH);
+      app.fire('change-query', {range: HistoryRange.MONTH});
       assertEquals(1, histogram[HistoryPageViewHistogram.GROUPED_MONTH]);
     });
   });
@@ -102,7 +102,7 @@ suite('Metrics', function() {
       assertEquals(1, histogramMap['HistoryPage.ClickPosition'][1]);
       assertEquals(1, histogramMap['HistoryPage.ClickPositionSubset'][1]);
 
-      app.set('queryState_.searchTerm', 'goog');
+      app.fire('change-query', {search: 'goog'});
       assertEquals(1, actionMap['Search']);
       app.set('queryState_.incremental', true);
       app.historyResult(createHistoryInfo('goog'), [