DOMUI Prefs: Add a deletable item list type, and use it for startup pages.

chrome/browser/resources/options/browser_options.js

Index: chrome/browser/resources/options/browser_options.js
diff --git a/chrome/browser/resources/options/browser_options.js b/chrome/browser/resources/options/browser_options.js
index 2d734a9706d61481a5e4dbdb57bb8d4b3399727b..dde0087ea7ebacb6448e0b77a426710eefe2908b 100644
--- a/chrome/browser/resources/options/browser_options.js
+++ b/chrome/browser/resources/options/browser_options.js
@@ -353,26 +353,6 @@ cr.define('options', function() {
     },
 
     /**
-     * Removes the selected startup pages.
-     * @private
-     */
-    removeSelectedStartupPages_: function() {
-      var selections =
-          $('startupPagesShortList').selectionModel.selectedIndexes.map(String);
-      chrome.send('removeStartupPages', selections);
-    },
-
-    /**
-     * Adds the given startup page at the current selection point.
-     * @private
-     */
-    addStartupPage_: function(url) {
-      var firstSelection =
-          $('startupPagesShortList').selectionModel.selectedIndex;
-      chrome.send('addStartupPage', [url, String(firstSelection)]);
-    },
-
-    /**
      * Set the default search engine based on the popup selection.
      */
     setDefaultSearchEngine: function() {
@@ -403,10 +383,6 @@ cr.define('options', function() {
     StartupPageManager.getInstance().updateStartupPages_(pages);
   };
 
-  BrowserOptions.addStartupPage = function(url) {
-    BrowserOptions.getInstance().addStartupPage_(url);
-  };
-
   // Export
   return {
     BrowserOptions: BrowserOptions