Remove single-window-metro-mode code paths for the app launcher and apps.

apps/shell/browser/shell_apps_client.cc

 // Copyright 2014 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 "apps/shell/browser/shell_apps_client.h"
 
 #include "apps/app_window.h"
 #include "apps/shell/browser/shell_app_window_delegate.h"
 
 using content::BrowserContext;
 
 namespace apps {
 
 ShellAppsClient::ShellAppsClient(BrowserContext* browser_context)
     : browser_context_(browser_context) {}
 
 ShellAppsClient::~ShellAppsClient() {}
 
 std::vector<BrowserContext*> ShellAppsClient::GetLoadedBrowserContexts() {
   std::vector<BrowserContext*> browser_contexts;
   browser_contexts.push_back(browser_context_);
   return browser_contexts;
 }
 
-bool ShellAppsClient::CheckAppLaunch(BrowserContext* context,
-                                     const extensions::Extension* extension) {
-  return true;
-}
-
 AppWindow* ShellAppsClient::CreateAppWindow(
     BrowserContext* context,
     const extensions::Extension* extension) {
   return new AppWindow(context, new ShellAppWindowDelegate, extension);
 }
 
 void ShellAppsClient::IncrementKeepAliveCount() {}
 
 void ShellAppsClient::DecrementKeepAliveCount() {}
 
 }  // namespace apps