Convert Pass()→std::move() for CrOS extension code.

chrome/browser/chromeos/extensions/file_manager/file_stream_md5_digester.cc

 // 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.
 
 #include "chrome/browser/chromeos/extensions/file_manager/file_stream_md5_digester.h"
 
+#include <utility>
+
 #include "base/callback.h"
 #include "net/base/net_errors.h"
 #include "storage/browser/fileapi/file_stream_reader.h"
 
 namespace drive {
 namespace util {
 
 namespace {
 
 const int kMd5DigestBufferSize = 512 * 1024;  // 512 kB.
 
 }  // namespace
 
 FileStreamMd5Digester::FileStreamMd5Digester()
     : buffer_(new net::IOBuffer(kMd5DigestBufferSize)) {}
 
 FileStreamMd5Digester::~FileStreamMd5Digester() {}
 
 void FileStreamMd5Digester::GetMd5Digest(
     scoped_ptr<storage::FileStreamReader> stream_reader,
     const ResultCallback& callback) {
-  reader_ = stream_reader.Pass();
+  reader_ = std::move(stream_reader);
   base::MD5Init(&md5_context_);
 
   // Start the read/hash.
   ReadNextChunk(callback);
 }
 
 void FileStreamMd5Digester::ReadNextChunk(const ResultCallback& callback) {
   const int result =
       reader_->Read(buffer_.get(), kMd5DigestBufferSize,
                     base::Bind(&FileStreamMd5Digester::OnChunkRead,
@@ skipping 20 matching lines @@
   // Read data and digest it.
   base::MD5Update(&md5_context_,
                   base::StringPiece(buffer_->data(), bytes_read));
 
   // Kick off the next read.
   ReadNextChunk(callback);
 }
 
 }  // namespace util
 }  // namespace drive