Convert //ash from scoped_ptr to std::unique_ptr

ash/host/ash_window_tree_host_x11.cc

 // 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.
 
 #include "ash/host/ash_window_tree_host_x11.h"
 
 #include <X11/Xatom.h>
 #include <X11/Xlib.h>
 #include <X11/extensions/XInput2.h>
 #include <X11/extensions/Xfixes.h>
@@ skipping 93 matching lines @@
     XFixesDestroyPointerBarrier(xdisplay(), pointer_barriers_[0]);
     XFixesDestroyPointerBarrier(xdisplay(), pointer_barriers_[1]);
     XFixesDestroyPointerBarrier(xdisplay(), pointer_barriers_[2]);
     XFixesDestroyPointerBarrier(xdisplay(), pointer_barriers_[3]);
     pointer_barriers_.reset();
   }
 #endif
 }
 
 void AshWindowTreeHostX11::SetRootWindowTransformer(
-    scoped_ptr<RootWindowTransformer> transformer) {
+    std::unique_ptr<RootWindowTransformer> transformer) {
   transformer_helper_.SetRootWindowTransformer(std::move(transformer));
   if (pointer_barriers_) {
     UnConfineCursor();
     ConfineCursorToRootWindow();
   }
 }
 
 gfx::Insets AshWindowTreeHostX11::GetHostInsets() const {
   return transformer_helper_.GetHostInsets();
 }
 
 aura::WindowTreeHost* AshWindowTreeHostX11::AsWindowTreeHost() { return this; }
 
 void AshWindowTreeHostX11::PrepareForShutdown() {
   // Block the root window from dispatching events because it is weird for a
   // ScreenPositionClient not to be attached to the root window and for
   // ui::EventHandlers to be unable to convert the event's location to screen
   // coordinates.
   window()->SetEventTargeter(
-      scoped_ptr<ui::EventTargeter>(new ui::NullEventTargeter));
+      std::unique_ptr<ui::EventTargeter>(new ui::NullEventTargeter));
 
   if (ui::PlatformEventSource::GetInstance()) {
     // Block X events which are not turned into ui::Events from getting
     // processed. (e.g. ConfigureNotify)
     ui::PlatformEventSource::GetInstance()->RemovePlatformEventDispatcher(this);
   }
 }
 
 void AshWindowTreeHostX11::SetBounds(const gfx::Rect& bounds) {
   WindowTreeHostX11::SetBounds(bounds);
@@ skipping 139 matching lines @@
                        8,
                        PropModeReplace,
                        &value,
                        1);
     }
   }
 }
 #endif  // defined(OS_CHROMEOS)
 
 }  // namespace ash