Convert //chrome/browser/chromeos from scoped_ptr to std::unique_ptr

chrome/browser/chromeos/extensions/file_manager/file_stream_md5_digester.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 CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_FILE_STREAM_MD5_DIGESTER_H_
 #define CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_FILE_STREAM_MD5_DIGESTER_H_
 
+#include <memory>
+
 #include "base/callback_forward.h"
 #include "base/macros.h"
 #include "base/md5.h"
 #include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
 #include "net/base/io_buffer.h"
 
 namespace storage {
 class FileStreamReader;
 }
 
 namespace drive {
 namespace util {
 
 // Computes the (base-16 encoded) MD5 digest of data extracted from a file
 // stream.
 class FileStreamMd5Digester {
  public:
   typedef base::Callback<void(const std::string&)> ResultCallback;
 
   FileStreamMd5Digester();
   ~FileStreamMd5Digester();
 
   // Computes an MD5 digest of data read from the given |streamReader|.  The
   // work occurs asynchronously, and the resulting hash is returned via the
   // |callback|.  If an error occurs, |callback| is called with an empty string.
   // Only one stream can be processed at a time by each digester.  Do not call
   // GetMd5Digest before the results of a previous call have been returned.
-  void GetMd5Digest(scoped_ptr<storage::FileStreamReader> stream_reader,
+  void GetMd5Digest(std::unique_ptr<storage::FileStreamReader> stream_reader,
                     const ResultCallback& callback);
 
  private:
   // Kicks off a read of the next chunk from the stream.
   void ReadNextChunk(const ResultCallback& callback);
   // Handles the incoming chunk of data from a stream read.
   void OnChunkRead(const ResultCallback& callback, int bytes_read);
 
   // Maximum chunk size for read operations.
-  scoped_ptr<storage::FileStreamReader> reader_;
+  std::unique_ptr<storage::FileStreamReader> reader_;
   scoped_refptr<net::IOBuffer> buffer_;
   base::MD5Context md5_context_;
 
   DISALLOW_COPY_AND_ASSIGN(FileStreamMd5Digester);
 };
 
 }  // namespace util
 }  // namespace drive
 
 #endif  // CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_FILE_STREAM_MD5_DIGESTER_H_