Convert //ash from scoped_ptr to std::unique_ptr

ash/host/ash_window_tree_host_x11.h

 // 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.
 
 #ifndef ASH_HOST_ASH_WINDOW_TREE_HOST_X11_H_
 #define ASH_HOST_ASH_WINDOW_TREE_HOST_X11_H_
 
+#include <memory>
+
 #include "ash/ash_export.h"
 #include "ash/host/ash_window_tree_host.h"
 #include "ash/host/transformer_helper.h"
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "ui/aura/env_observer.h"
 #include "ui/aura/window_tree_host_x11.h"
 
 namespace ash {
 class RootWindowTransformer;
 class MouseCursorEventFilter;
 
 class ASH_EXPORT AshWindowTreeHostX11 : public AshWindowTreeHost,
                                         public aura::WindowTreeHostX11,
                                         public aura::EnvObserver {
  public:
   explicit AshWindowTreeHostX11(const gfx::Rect& initial_bounds);
   ~AshWindowTreeHostX11() override;
 
  private:
   // AshWindowTreeHost:
   void ToggleFullScreen() override;
   bool ConfineCursorToRootWindow() override;
   void UnConfineCursor() override;
   void SetRootWindowTransformer(
-      scoped_ptr<RootWindowTransformer> transformer) override;
+      std::unique_ptr<RootWindowTransformer> transformer) override;
   gfx::Insets GetHostInsets() const override;
   aura::WindowTreeHost* AsWindowTreeHost() override;
   void PrepareForShutdown() override;
 
   // aura::WindowTreehost:
   void SetBounds(const gfx::Rect& bounds) override;
   gfx::Transform GetRootTransform() const override;
   void SetRootTransform(const gfx::Transform& transform) override;
   gfx::Transform GetInverseRootTransform() const override;
   void UpdateRootWindowSize(const gfx::Size& host_size) override;
@@ skipping 11 matching lines @@
   // ui::internal::InputMethodDelegate:
   ui::EventDispatchDetails DispatchKeyEventPostIME(
       ui::KeyEvent* event) override;
 
 #if defined(OS_CHROMEOS)
   // Set the CrOS touchpad "tap paused" property. It is used to temporarily
   // turn off the Tap-to-click feature when the mouse pointer is invisible.
   void SetCrOSTapPaused(bool state);
 #endif
 
-  scoped_ptr<XID[]> pointer_barriers_;
+  std::unique_ptr<XID[]> pointer_barriers_;
 
   TransformerHelper transformer_helper_;
 
   DISALLOW_COPY_AND_ASSIGN(AshWindowTreeHostX11);
 };
 
 }  // namespace ash
 
 #endif  // ASH_HOST_ASH_WINDOW_TREE_HOST_X11_H_