mus: aura::Env should be destroyed last in the mus client.

ui/views/mus/aura_init.h

 // Copyright 2015 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.
 
 #ifndef UI_VIEWS_MUS_AURA_INIT_H_
 #define UI_VIEWS_MUS_AURA_INIT_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 57 matching lines @@
  private:
   void InitializeResources(service_manager::Connector* connector);
 
 #if defined(OS_LINUX)
   sk_sp<font_service::FontLoader> font_loader_;
 #endif
 
   const std::string resource_file_;
   const std::string resource_file_200_;
 
+  std::unique_ptr<aura::Env> env_;
   std::unique_ptr<MusClient> mus_client_;
-  std::unique_ptr<aura::Env> env_;
   std::unique_ptr<ViewsDelegate> views_delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(AuraInit);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_MUS_AURA_INIT_H_