Add RetainedRef uses where needed.

chrome/browser/media_galleries/linux/mtp_device_delegate_impl_linux.cc

 // Copyright (c) 2012 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/linux/mtp_device_delegate_impl_linux.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <stddef.h>
 
@@ skipping 609 matching lines @@
 
 void MTPDeviceDelegateImplLinux::ReadBytes(
     const base::FilePath& device_file_path,
     const scoped_refptr<net::IOBuffer>& buf,
     int64_t offset,
     int buf_len,
     const ReadBytesSuccessCallback& success_callback,
     const ErrorCallback& error_callback) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
   DCHECK(!device_file_path.empty());
-  base::Closure closure =
-      base::Bind(&MTPDeviceDelegateImplLinux::ReadBytesInternal,
-                 weak_ptr_factory_.GetWeakPtr(),
-                 device_file_path,
-                 buf,
-                 offset,
-                 buf_len,
-                 success_callback,
-                 error_callback);
+  base::Closure closure = base::Bind(
+      &MTPDeviceDelegateImplLinux::ReadBytesInternal,
+      weak_ptr_factory_.GetWeakPtr(), device_file_path, base::RetainedRef(buf),
+      offset, buf_len, success_callback, error_callback);
   EnsureInitAndRunTask(PendingTaskInfo(device_file_path,
                                        content::BrowserThread::IO,
                                        FROM_HERE,
                                        closure));
 }
 
 bool MTPDeviceDelegateImplLinux::IsReadOnly() const {
   return read_only_;
 }
 
@@ skipping 1249 matching lines @@
   }
 }
 
 void CreateMTPDeviceAsyncDelegate(
     const std::string& device_location,
     const bool read_only,
     const CreateMTPDeviceAsyncDelegateCallback& callback) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
   callback.Run(new MTPDeviceDelegateImplLinux(device_location, read_only));
 }