MD History: Remove isFirstItem property from history-item

chrome/browser/resources/md_history/app.crisper.js

Index: chrome/browser/resources/md_history/app.crisper.js
diff --git a/chrome/browser/resources/md_history/app.crisper.js b/chrome/browser/resources/md_history/app.crisper.js
index 8d12dc9b2acc3404c50574e36a829109968e579b..87f740f7a0da36584610210a1a3acf2a48624938 100644
--- a/chrome/browser/resources/md_history/app.crisper.js
+++ b/chrome/browser/resources/md_history/app.crisper.js
@@ -6711,10 +6711,6 @@ cr.define('md_history', function() {
         type: Boolean,
         reflectToAttribute: true
       },
-      isFirstItem: {
-        type: Boolean,
-        reflectToAttribute: true
-      },
       isCardStart: {
         type: Boolean,
         reflectToAttribute: true
@@ -8058,9 +8054,6 @@ Polymer({
     if (length == 0 || i > length - 1) return false;
     return i == length - 1 || this.historyData_[i].dateRelativeDay != this.historyData_[i + 1].dateRelativeDay;
   },
-  isFirstItem_: function(index) {
-    return index == 0;
-  },
   notifyListScroll_: function() {
     this.fire('history-list-scrolled');
   },