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

chrome/browser/chromeos/file_system_provider/fileapi/buffering_file_stream_writer.cc

 // Copyright 2014 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/browser/chromeos/file_system_provider/fileapi/buffering_file_stream_writer.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "net/base/io_buffer.h"
 #include "net/base/net_errors.h"
 
 namespace chromeos {
 namespace file_system_provider {
 
 BufferingFileStreamWriter::BufferingFileStreamWriter(
-    scoped_ptr<storage::FileStreamWriter> file_stream_writer,
+    std::unique_ptr<storage::FileStreamWriter> file_stream_writer,
     int intermediate_buffer_length)
     : file_stream_writer_(std::move(file_stream_writer)),
       intermediate_buffer_length_(intermediate_buffer_length),
       intermediate_buffer_(new net::IOBuffer(intermediate_buffer_length_)),
       buffered_bytes_(0),
       weak_ptr_factory_(this) {}
 
 BufferingFileStreamWriter::~BufferingFileStreamWriter() {
   if (buffered_bytes_)
     LOG(ERROR) << "File stream writer not flushed. Data will be lost.";
@@ skipping 147 matching lines @@
     callback.Run(result);
     return;
   }
 
   const int flush_result = file_stream_writer_->Flush(callback);
   DCHECK_EQ(net::ERR_IO_PENDING, flush_result);
 }
 
 }  // namespace file_system_provider
 }  // namespace chromeos