Put the pop-up app launcher behind a compile-time flag, and provide defines.

chrome/browser/ui/app_list/app_list_controller.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/ui/app_list/app_list_controller.h"
 
 #include "base/logging.h"
 #include "build/build_config.h"
 
 AppListControllerDelegate::~AppListControllerDelegate() {}

[sky, 2012/11/14 15:54:57]

Why do we even compile this file when !ENABLE_APP_LIST ?

[tapted, 2012/11/14 22:35:37]

It was used unconditionally in startup_browser_creator_impl.cc, but it's easy to
#ifdef out now without cluttering things up (done).

 
 void AppListControllerDelegate::ViewClosing() {}
 
 void AppListControllerDelegate::ViewActivationChanged(bool active) {}
 
 bool AppListControllerDelegate::IsAppPinned(const std::string& extension_id) {
   return false;
 }
 
 void AppListControllerDelegate::PinApp(const std::string& extension_id) {}
 
 void AppListControllerDelegate::UnpinApp(const std::string& extension_id) {}
 
 void AppListControllerDelegate::ShowCreateShortcutsDialog(
     Profile* profile,
     const std::string& extension_id) {}
 
 void AppListControllerDelegate::CreateNewWindow(bool incognito) {
   NOTREACHED();
 }
 
 namespace app_list_controller {
 
-#if !defined(OS_WIN)
+#if !defined(ENABLE_APP_LIST) || defined(OS_CHROMEOS)
 // Default implementation for ports which do not have this implemented.
 void ShowAppList() {}
 
 // Default implementation for ports which do not have this implemented.
 void CheckAppListTaskbarShortcut() {}
 #endif
 
 }  // namespace app_list_controller