Fixes deleting history when there is only one item

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 6829 matching lines @@
         var item = array.splice(index, 1);
         splices.push({
           index: index,
           removed: [ item ],
           addedCount: 0,
           object: array,
           type: 'splice'
         });
       }
     }.bind(this));
-    if (array.length == 0) return true;
+    if (array.length == 0 && node.currentPath.indexOf('.') != -1) return true;
     this.notifySplices(node.currentPath, splices);
     return false;
   },
   itemSelected_: function(e) {
     var item = e.detail.element;
     var paths = [];
     var itemPath = item.path;
     if (e.detail.shiftKey && this.lastSelectedPath) {
       var itemPathComponents = itemPath.split('.');
       var itemIndex = Number(itemPathComponents.pop());
@@ skipping 1805 matching lines @@
     this.set('routeData_.page', selectedPage);
   },
   getSelectedPage_: function(selectedPage, items) {
     return selectedPage;
   },
   closeDrawer_: function() {
     var drawer = this.$$('#drawer');
     if (drawer) drawer.close();
   }
 });