Remove implicit conversions from scoped_refptr to T* in chrome/browser/media_galleries/

chrome/browser/media_galleries/fileapi/mtp_file_stream_reader.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/media_galleries/fileapi/mtp_file_stream_reader.h"
 
 #include <algorithm>
 
 #include "base/numerics/safe_conversions.h"
 #include "chrome/browser/media_galleries/fileapi/mtp_device_async_delegate.h"
@@ skipping 86 matching lines @@
       // If requested read includes all the header bytes, we read directly to
       // the original buffer, and validate the header bytes within that.
       header_buf = buf;
       header_buf_len = buf_len;
     } else {
       // Otherwise, make a special request for the header.
       header_buf = new net::IOBuffer(net::kMaxBytesToSniff);
       header_buf_len = net::kMaxBytesToSniff;
     }
 
-    ReadBytes(url_, header_buf, 0, header_buf_len,
+    ReadBytes(url_,
+              header_buf.get(),
+              0,
+              header_buf_len,
               base::Bind(&MTPFileStreamReader::FinishValidateMediaHeader,
-                         weak_factory_.GetWeakPtr(), header_buf,
-                         make_scoped_refptr(buf), buf_len, callback),
+                         weak_factory_.GetWeakPtr(),
+                         header_buf,
+                         make_scoped_refptr(buf),
+                         buf_len,
+                         callback),
               callback);
     return net::ERR_IO_PENDING;
   }
 
   ReadBytes(url_, buf, current_offset_, buf_len,
             base::Bind(&MTPFileStreamReader::FinishRead,
                        weak_factory_.GetWeakPtr(), callback),
             callback);
 
   return net::ERR_IO_PENDING;
@@ skipping 67 matching lines @@
     const base::File::Info& file_info) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
 
   if (!VerifySnapshotTime(expected_modification_time_, file_info)) {
     callback.Run(net::ERR_UPLOAD_FILE_CHANGED);
     return;
   }
 
   callback.Run(file_info.size);
 }