Add enable-app-shims to chrome://flags.

chrome/browser/resources/ntp4/apps_page.js

Index: chrome/browser/resources/ntp4/apps_page.js
diff --git a/chrome/browser/resources/ntp4/apps_page.js b/chrome/browser/resources/ntp4/apps_page.js
index 852887d79efd671f1b2e53c2e230620d9d6811b6..f7f076a8276d032765ebae8f18f572d80a51855e 100644
--- a/chrome/browser/resources/ntp4/apps_page.js
+++ b/chrome/browser/resources/ntp4/apps_page.js
@@ -39,6 +39,12 @@ cr.define('ntp', function() {
   cr.addSingletonGetter(AppContextMenu);
 
   AppContextMenu.prototype = {
+    /**
+     * If true, the "Create shortcuts" context menu entry will be hidden.
+     * @type {boolean}
+     */
+    disableCreateAppShortcut: false,

[tapted, 2013/05/30 05:32:24]

pretty sure this should be in initialize(), with a this. and and underscore at
the end. i.e. (in initialize)

this.disableCreateAppShortcut_ = false;

Then, you'll need a function to set it, since it's "private"

+
     initialize: function() {
       var menu = new cr.ui.Menu;
       cr.ui.decorate(menu, cr.ui.Menu);
@@ -73,7 +79,7 @@ cr.define('ntp', function() {
       this.uninstall_.addEventListener('activate',
                                        this.onUninstall_.bind(this));
 
-      if (!(cr.isChromeOS || cr.isMac)) {
+      if (!cr.isChromeOS) {
         this.createShortcutSeparator_ =
             menu.appendChild(cr.ui.MenuItem.createSeparator());
         this.createShortcut_ = this.appendMenuItem_('appcreateshortcut');
@@ -140,12 +146,12 @@ cr.define('ntp', function() {
       this.details_.disabled = !app.appData.detailsUrl;
       this.uninstall_.disabled = !app.appData.mayDisable;
 
-      if (this.createShortcut_ && cr.isMac) {
+      if (cr.isMac) {
         // On Windows and Linux, these should always be visible. On ChromeOS,
         // they are never created. On Mac, shortcuts can only be created for
         // new-style packaged apps, so hide the menu item.
         this.createShortcutSeparator_.hidden = this.createShortcut_.hidden =
-            !app.appData.packagedApp;
+            !app.appData.packagedApp || this.disableCreateAppShortcut;
       }
     },
 
@@ -549,6 +555,13 @@ cr.define('ntp', function() {
     },
 
     /**
+     * Disable the "Create shortcut" context menu item.
+     */
+    disableCreateAppShortcut: function() {
+      AppContextMenu.getInstance().disableCreateAppShortcut = true;
+    },
+
+    /**
      * Highlight a newly installed app as it's added to the NTP.
      * @param {Object} appData The data object that describes the app.
      */