Rewrite scoped_ptr<T>(NULL) to use the default ctor in chrome/.

chrome/common/extensions/permissions/api_permission.cc

 // Copyright (c) 2012 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 "chrome/common/extensions/permissions/api_permission.h"
 
 #include "ui/base/l10n/l10n_util.h"
 
 namespace {
 
@@ skipping 37 matching lines @@
     return true;
   }
 
   virtual bool FromValue(const base::Value* value) OVERRIDE {
     if (value)
       return false;
     return true;
   }
 
   virtual scoped_ptr<base::Value> ToValue() const OVERRIDE {
-    return scoped_ptr<base::Value>(NULL);
+    return scoped_ptr<base::Value>();
   }
 
   virtual APIPermission* Clone() const OVERRIDE {
     return new SimpleAPIPermission(info());
   }
 
   virtual APIPermission* Diff(const APIPermission* rhs) const OVERRIDE {
     CHECK(info() == rhs->info());
     return NULL;
   }
@@ skipping 69 matching lines @@
   return api_permission_constructor_ ?
     api_permission_constructor_(this) : new SimpleAPIPermission(this);
 }
 
 PermissionMessage APIPermissionInfo::GetMessage_() const {
   return PermissionMessage(
       message_id_, l10n_util::GetStringUTF16(l10n_message_id_));
 }
 
 }  // namespace extensions