favor DCHECK_CURRENTLY_ON for better logs in chrome/browser/chromeos/

chrome/browser/chromeos/drive/fileapi/webkit_file_stream_writer_impl.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/drive/fileapi/webkit_file_stream_writer_impl.h"
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "chrome/browser/chromeos/drive/file_system_util.h"
 #include "chrome/browser/chromeos/drive/fileapi/fileapi_worker.h"
 #include "content/public/browser/browser_thread.h"
 #include "google_apis/drive/task_util.h"
 #include "net/base/io_buffer.h"
 #include "net/base/net_errors.h"
 #include "storage/browser/fileapi/file_stream_writer.h"
 
 using content::BrowserThread;
 
 namespace drive {
 namespace internal {
 namespace {
 
 // Creates a writable snapshot file of the |drive_path|.
 void CreateWritableSnapshotFile(
     const WebkitFileStreamWriterImpl::FileSystemGetter& file_system_getter,
     const base::FilePath& drive_path,
     const fileapi_internal::CreateWritableSnapshotFileCallback& callback) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
 
   BrowserThread::PostTask(
       BrowserThread::UI,
       FROM_HERE,
       base::Bind(
           &fileapi_internal::RunFileSystemCallback,
           file_system_getter,
           base::Bind(&fileapi_internal::CreateWritableSnapshotFile,
                      drive_path, google_apis::CreateRelayCallback(callback)),
           google_apis::CreateRelayCallback(base::Bind(
@@ skipping 134 matching lines @@
       local_path,
       offset_,
       storage::FileStreamWriter::OPEN_EXISTING_FILE));
   int result = local_file_writer_->Write(buf, buf_len, callback);
   if (result != net::ERR_IO_PENDING)
     callback.Run(result);
 }
 
 }  // namespace internal
 }  // namespace drive