Explicit initialization of aura::Env for browser shell.

ui/aura/demo/demo_main.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 "base/at_exit.h"
 #include "base/command_line.h"
 #include "base/i18n/icu_util.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "third_party/skia/include/core/SkXfermode.h"
@@ skipping 97 matching lines @@
 };
 
 int DemoMain() {
   // Create the message-loop here before creating the root window.
   base::MessageLoop message_loop(base::MessageLoop::TYPE_UI);
 
   // The ContextFactory must exist before any Compositors are created.
   bool allow_test_contexts = false;
   ui::Compositor::InitializeContextFactoryForTests(allow_test_contexts);
 
-  aura::Env::GetInstance();
+  aura::Env::CreateInstance();
   scoped_ptr<aura::TestScreen> test_screen(aura::TestScreen::Create());
   gfx::Screen::SetScreenInstance(gfx::SCREEN_TYPE_NATIVE, test_screen.get());
   scoped_ptr<aura::RootWindow> root_window(
       test_screen->CreateRootWindowForPrimaryDisplay());
   scoped_ptr<DemoStackingClient> stacking_client(new DemoStackingClient(
       root_window.get()));
   aura::FocusManager focus_manager;
   aura::client::SetFocusClient(root_window.get(), &focus_manager);
 
   // Create a hierarchy of test windows.
@@ skipping 34 matching lines @@
 
   // The exit manager is in charge of calling the dtors of singleton objects.
   base::AtExitManager exit_manager;
 
   ui::RegisterPathProvider();
   base::i18n::InitializeICU();
   ResourceBundle::InitSharedInstanceWithLocale("en-US", NULL);
 
   return DemoMain();
 }