Don't show the apps page on the NTP if the app launcher is installed.

chrome/browser/extensions/extension_install_ui_default.cc

 // Copyright (c) 2012 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.
 
 #include "chrome/browser/extensions/extension_install_ui_default.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/api/infobars/confirm_infobar_delegate.h"
@@ skipping 170 matching lines @@
 
   if (extension->is_app()) {
     bool use_bubble = false;
 
 #if defined(TOOLKIT_VIEWS)
     CommandLine* cmdline = CommandLine::ForCurrentProcess();
     use_bubble = (use_app_installed_bubble_ ||
                   cmdline->HasSwitch(switches::kAppsNewInstallBubble));
 #endif
 
-    extensions::GetIsAppLauncherEnabled(
+    extensions::UpdateIsAppLauncherEnabled(
         base::Bind(&OnAppLauncherEnabledCompleted, extension, browser, icon,
                    use_bubble));
     return;
   }
 
   chrome::ShowExtensionInstalledBubble(extension, browser, *icon);
 }
 
 void ExtensionInstallUIDefault::OnInstallFailure(
     const extensions::CrxInstallerError& error) {
@@ skipping 59 matching lines @@
   return new ExtensionInstallPrompt(web_contents);
 }
 
 // static
 ExtensionInstallPrompt* ExtensionInstallUI::CreateInstallPromptWithProfile(
     Profile* profile) {
   Browser* browser = chrome::FindLastActiveWithProfile(profile,
       chrome::GetActiveDesktop());
   return CreateInstallPromptWithBrowser(browser);
 }