Add ShellDelegate, MediaDelegate and KeyboardUI stubs to mus ash

ash/mus/shell_delegate_mus.h

 // Copyright 2016 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 ASH_SYSUI_SHELL_DELEGATE_MUS_H_
-#define ASH_SYSUI_SHELL_DELEGATE_MUS_H_
+#ifndef ASH_MUS_SHELL_DELEGATE_MUS_H_
+#define ASH_MUS_SHELL_DELEGATE_MUS_H_
 
 #include <memory>
 
 #include "ash/common/shell_delegate.h"
 #include "base/macros.h"
 
-namespace keyboard {
-class KeyboardUI;
+namespace app_list {
+class AppListPresenter;
 }
 
 namespace ash {
 
-class AppListPresenterMus;
-
-namespace sysui {
-
 class ShellDelegateMus : public ShellDelegate {
  public:
-  explicit ShellDelegateMus(std::unique_ptr<AppListPresenterMus>);
+  explicit ShellDelegateMus(std::unique_ptr<app_list::AppListPresenter>);

[msw, 2016/07/14 19:50:05]

optional nit: give this parameter a name here, |app_list_presenter|.

[James Cook, 2016/07/14 20:54:44]

Whoops! Done.

   ~ShellDelegateMus() override;
 
   bool IsFirstRunAfterBoot() const override;
   bool IsIncognitoAllowed() const override;
   bool IsMultiProfilesEnabled() const override;
   bool IsRunningInForcedAppMode() const override;
   bool CanShowWindowForUser(WmWindow* window) const override;
   bool IsForceMaximizeOnFirstRun() const override;
   void PreInit() override;
   void PreShutdown() override;
@@ skipping 15 matching lines @@
   GPUSupport* CreateGPUSupport() override;
   base::string16 GetProductName() const override;
   gfx::Image GetDeprecatedAcceleratorImage() const override;
 
  private:
   std::unique_ptr<app_list::AppListPresenter> app_list_presenter_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellDelegateMus);
 };
 
-}  // namespace sysui
 }  // namespace ash
 
-#endif  // ASH_SYSUI_SHELL_DELEGATE_MUS_H_
+#endif  // ASH_MUS_SHELL_DELEGATE_MUS_H_