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

chrome/browser/resources/md_history/grouped_list.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.
 
 /**
  * @typedef {{domain: string,
  *            visits: !Array<HistoryEntry>,
  *            rendered: boolean,
  *            expanded: boolean}}
  */
@@ skipping 85 matching lines @@
     if (this.historyData.length == 0) {
       this.groupedHistoryData_ = [];
       return;
     }
 
     if (this.range == HistoryRange.WEEK) {
       // Group each day into a list of results.
       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];
         if (!visitsSameDay(visit, currentDayVisits[0])) {
           pushCurrentDay();
           currentDayVisits = [];
         }
         currentDayVisits.push(visit);
       }
       pushCurrentDay();
@@ skipping 61 matching lines @@
 
   /**
    * @param {boolean} expanded
    * @return {string}
    * @private
    */
   getDropdownIcon_: function(expanded) {
     return expanded ? 'cr:expand-less' : 'cr:expand-more';
   },
 });