Convert //ash from scoped_ptr to std::unique_ptr

ash/mus/keyboard_ui_mus.cc

Index: ash/mus/keyboard_ui_mus.cc
diff --git a/ash/mus/keyboard_ui_mus.cc b/ash/mus/keyboard_ui_mus.cc
index ce38aded4bc3002fbd3dc057c8018c6612abb8ee..ddaa7b76818dbee0e763eb2176f8d0ae5980f4b6 100644
--- a/ash/mus/keyboard_ui_mus.cc
+++ b/ash/mus/keyboard_ui_mus.cc
@@ -7,6 +7,7 @@
 #include "ash/keyboard/keyboard_ui_observer.h"
 #include "ash/shell.h"
 #include "ash/shell_delegate.h"
+#include "base/memory/ptr_util.h"
 #include "mojo/shell/public/cpp/connector.h"
 
 namespace ash {
@@ -21,8 +22,8 @@ KeyboardUIMus::KeyboardUIMus(mojo::Connector* connector)
 KeyboardUIMus::~KeyboardUIMus() {}
 
 // static
-scoped_ptr<KeyboardUI> KeyboardUIMus::Create(mojo::Connector* connector) {
-  return make_scoped_ptr(new KeyboardUIMus(connector));
+std::unique_ptr<KeyboardUI> KeyboardUIMus::Create(mojo::Connector* connector) {
+  return base::WrapUnique(new KeyboardUIMus(connector));
 }
 
 void KeyboardUIMus::Hide() {