Extract content dependency from keyboard code

ash/shell/shell_delegate_impl.h

 // 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.
 
 #ifndef ASH_SHELL_SHELL_DELEGATE_IMPL_H_
 #define ASH_SHELL_SHELL_DELEGATE_IMPL_H_
 
 #include <string>
 
 #include "ash/shell_delegate.h"
 #include "base/compiler_specific.h"
 
 namespace keyboard {
-class KeyboardControllerProxy;
+class KeyboardUI;
 }
 
 namespace ash {
 namespace shell {
 
 class ShelfDelegateImpl;
 class WindowWatcher;
 
 class ShellDelegateImpl : public ash::ShellDelegate {
  public:
   ShellDelegateImpl();
   ~ShellDelegateImpl() override;
 
   void SetWatcher(WindowWatcher* watcher);
 
   bool IsFirstRunAfterBoot() const override;
   bool IsIncognitoAllowed() const override;
   bool IsMultiProfilesEnabled() const override;
   bool IsRunningInForcedAppMode() const override;
   bool IsMultiAccountEnabled() const override;
   bool CanShowWindowForUser(aura::Window* window) const override;
   bool IsForceMaximizeOnFirstRun() const override;
   void PreInit() override;
   void PreShutdown() override;
   void Exit() override;
-  keyboard::KeyboardControllerProxy* CreateKeyboardControllerProxy() override;
+  keyboard::KeyboardUI* CreateKeyboardUI() override;
   void VirtualKeyboardActivated(bool activated) override;
   void AddVirtualKeyboardStateObserver(
       VirtualKeyboardStateObserver* observer) override;
   void RemoveVirtualKeyboardStateObserver(
       VirtualKeyboardStateObserver* observer) override;
   app_list::AppListViewDelegate* GetAppListViewDelegate() override;
   ShelfDelegate* CreateShelfDelegate(ShelfModel* model) override;
   ash::SystemTrayDelegate* CreateSystemTrayDelegate() override;
   ash::UserWallpaperDelegate* CreateUserWallpaperDelegate() override;
   ash::SessionStateDelegate* CreateSessionStateDelegate() override;
@@ skipping 14 matching lines @@
   ShelfDelegateImpl* shelf_delegate_;
   scoped_ptr<app_list::AppListViewDelegate> app_list_view_delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellDelegateImpl);
 };
 
 }  // namespace shell
 }  // namespace ash
 
 #endif  // ASH_SHELL_SHELL_DELEGATE_IMPL_H_