MD History/Downloads: convert .bind(this) and function property values to use =>

chrome/browser/resources/md_history/grouped_list.js

Index: chrome/browser/resources/md_history/grouped_list.js
diff --git a/chrome/browser/resources/md_history/grouped_list.js b/chrome/browser/resources/md_history/grouped_list.js
index 062d6865bfc8a69ccebc73e096d5f67f360dc73d..d44a76eb0643eaaff38880d80ad56222e0c6ca98 100644
--- a/chrome/browser/resources/md_history/grouped_list.js
+++ b/chrome/browser/resources/md_history/grouped_list.js
@@ -103,20 +103,20 @@ Polymer({
       var days = [];
       var currentDayVisits = [this.historyData[0]];
 
-      var pushCurrentDay = function() {
+      var pushCurrentDay = () => {
         days.push({
           title: this.searchedTerm ? currentDayVisits[0].dateShort :
               currentDayVisits[0].dateRelativeDay,
           domains: this.createHistoryDomains_(currentDayVisits),
         });
-      }.bind(this);
+      };
 
-      var visitsSameDay = function(a, b) {
+      var visitsSameDay = (a, b) => {
         if (this.searchedTerm)
           return a.dateShort == b.dateShort;
 
         return a.dateRelativeDay == b.dateRelativeDay;
-      }.bind(this);
+      };
 
       for (var i = 1; i < this.historyData.length; i++) {
         var visit = this.historyData[i];