Fix a bunch of IWYU violators that don't include scoped_ptr.h

content/browser/notifications/notification_database.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 CONTENT_BROWSER_NOTIFICATIONS_NOTIFICATION_DATABASE_H_
 #define CONTENT_BROWSER_NOTIFICATIONS_NOTIFICATION_DATABASE_H_
 
 #include <stdint.h>
+
 #include <set>
 #include <vector>
 
 #include "base/files/file_path.h"
 #include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
 #include "base/sequence_checker.h"
 #include "content/common/content_export.h"
 
 class GURL;
 
 namespace leveldb {
 class DB;
 class Env;
 class FilterPolicy;
 class WriteBatch;
@@ skipping 169 matching lines @@
   State state_ = STATE_UNINITIALIZED;
 
   base::SequenceChecker sequence_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(NotificationDatabase);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_NOTIFICATIONS_NOTIFICATION_DATABASE_H_