Convert //ash from scoped_ptr to std::unique_ptr

ash/cast_config_delegate.h

 // Copyright 2015 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_CAST_CONFIG_DELEGATE_H_
 #define ASH_CAST_CONFIG_DELEGATE_H_
 
+#include <memory>
 #include <string>
 #include <vector>
 
 #include "ash/ash_export.h"
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/strings/string16.h"
 #include "url/gurl.h"
 
 namespace ash {
 
 // This delegate allows the UI code in ash, e.g. |TrayCastDetailedView|,
 // to access the cast extension.
 class CastConfigDelegate {
  public:
   struct ASH_EXPORT Receiver {
@@ skipping 91 matching lines @@
   virtual void AddObserver(Observer* observer) = 0;
   virtual void RemoveObserver(Observer* observer) = 0;
 
  private:
   DISALLOW_ASSIGN(CastConfigDelegate);
 };
 
 }  // namespace ash
 
 #endif  // ASH_CAST_CONFIG_DELEGATE_H_