Replace SmartPointer<T> with unique_ptr<T>

src/objects.h

 // Copyright 2015 the V8 project 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 V8_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 #include <memory>
 
 #include "src/assert-scope.h"
 #include "src/bailout-reason.h"
 #include "src/base/bits.h"
 #include "src/base/flags.h"
-#include "src/base/smart-pointers.h"
 #include "src/builtins/builtins.h"
 #include "src/checks.h"
 #include "src/elements-kind.h"
 #include "src/field-index.h"
 #include "src/flags.h"
 #include "src/list.h"
 #include "src/property-details.h"
 #include "src/unicode-decoder.h"
 #include "src/unicode.h"
 #include "src/zone.h"
@@ skipping 10978 matching lines @@
     }
     return value;
   }
 };
 
 
 }  // NOLINT, false-positive due to second-order macros.
 }  // NOLINT, false-positive due to second-order macros.
 
 #endif  // V8_OBJECTS_H_