MD History: truncate title to 300 chars in C++ instead of JS

chrome/browser/resources/md_history/app.crisper.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.
 function PromiseResolver() {
   this.resolve_;
   this.reject_;
   this.promise_ = new Promise(function(resolve, reject) {
     this.resolve_ = resolve;
     this.reject_ = reject;
   }.bind(this));
@@ skipping 6839 matching lines @@
     showIcon_: function() {
       this.$.icon.style.backgroundImage = cr.icon.getFavicon(this.item.url);
     },
     selectionNotAllowed_: function() {
       return !loadTimeData.getBoolean('allowDeletingHistory');
     },
     cardTitle_: function(numberOfItems, historyDate, search) {
       if (!search) return this.item.dateRelativeDay;
       var resultId = numberOfItems == 1 ? 'searchResult' : 'searchResults';
       return loadTimeData.getStringF('foundSearchResults', numberOfItems, loadTimeData.getString(resultId), search);
-    },
-    cropItemTitle_: function(title) {
-      return title.length > TITLE_MAX_LENGTH ? title.substr(0, TITLE_MAX_LENGTH) : title;
     }
   });
   HistoryItem.needsTimeGap = function(visits, currentIndex, searchedTerm) {
     if (currentIndex >= visits.length - 1 || visits.length == 0) return false;
     var currentItem = visits[currentIndex];
     var nextItem = visits[currentIndex + 1];
     if (searchedTerm) return currentItem.dateShort != nextItem.dateShort;
     return currentItem.time - nextItem.time > BROWSING_GAP_TIME && currentItem.dateRelativeDay == nextItem.dateRelativeDay;
   };
   return {
@@ skipping 1921 matching lines @@
 
        case HistoryRange.MONTH:
         histogramValue = HistoryPageViewHistogram.GROUPED_MONTH;
         break;
       }
       break;
     }
     md_history.BrowserService.getInstance().recordHistogram('History.HistoryPageView', histogramValue, HistoryPageViewHistogram.END);
   }
 });