Convert //extensions/browser from scoped_ptr to std::unique_ptr

extensions/browser/value_store/leveldb_scoped_database.h

 // Copyright 2016 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 EXTENSIONS_BROWSER_VALUE_STORE_LEVELDB_SCOPED_DATABASE_H_
 #define EXTENSIONS_BROWSER_VALUE_STORE_LEVELDB_SCOPED_DATABASE_H_
 
 #include <string>
 
 #include "base/macros.h"
@@ skipping 28 matching lines @@
   static bool CreateKey(const std::string& scope,
                         const std::string& key,
                         std::string* scoped_key);
 
   LeveldbScopedDatabase(const std::string& uma_client_name,
                         const base::FilePath& path);
 
   // Reads a single |value| from the database for the specified |key|.
   ValueStore::Status Read(const std::string& scope,
                           const std::string& key,
-                          scoped_ptr<base::Value>* value);
+                          std::unique_ptr<base::Value>* value);
 
   // Reads all |values| from the database stored within the specified |scope|.
   ValueStore::Status Read(const std::string& scope,
                           base::DictionaryValue* values);
 
   // Writes a single |key| => |value| to the database.
   ValueStore::Status Write(const std::string& scope,
                            const std::string& key,
                            const base::Value& value);
 
@@ skipping 12 matching lines @@
   static ValueStore::Status AddToWriteBatch(leveldb::WriteBatch* batch,
                                             const std::string& scope,
                                             const std::string& key,
                                             const base::Value& value);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(LeveldbScopedDatabase);
 };
 
 #endif  // EXTENSIONS_BROWSER_VALUE_STORE_LEVELDB_SCOPED_DATABASE_H_