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

chrome/browser/chromeos/drive/fileapi/file_system_backend_delegate.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/file_system_backend_delegate.h"
 
 #include "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/chromeos/drive/file_system_interface.h"
@@ skipping 61 matching lines @@
 
 FileSystemBackendDelegate::FileSystemBackendDelegate()
     : async_file_util_(new internal::AsyncFileUtil) {
 }
 
 FileSystemBackendDelegate::~FileSystemBackendDelegate() {
 }
 
 storage::AsyncFileUtil* FileSystemBackendDelegate::GetAsyncFileUtil(
     storage::FileSystemType type) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
   DCHECK_EQ(storage::kFileSystemTypeDrive, type);
   return async_file_util_.get();
 }
 
 scoped_ptr<storage::FileStreamReader>
 FileSystemBackendDelegate::CreateFileStreamReader(
     const storage::FileSystemURL& url,
     int64 offset,
     int64 max_bytes_to_read,
     const base::Time& expected_modification_time,
     storage::FileSystemContext* context) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
   DCHECK_EQ(storage::kFileSystemTypeDrive, url.type());
 
   base::FilePath file_path = util::ExtractDrivePathFromFileSystemUrl(url);
   if (file_path.empty())
     return scoped_ptr<storage::FileStreamReader>();
 
   return scoped_ptr<storage::FileStreamReader>(
       new internal::WebkitFileStreamReaderImpl(
           base::Bind(&fileapi_internal::GetFileSystemFromUrl, url),
           context->default_file_task_runner(),
           file_path,
           offset,
           expected_modification_time));
 }
 
 scoped_ptr<storage::FileStreamWriter>
 FileSystemBackendDelegate::CreateFileStreamWriter(
     const storage::FileSystemURL& url,
     int64 offset,
     storage::FileSystemContext* context) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
   DCHECK_EQ(storage::kFileSystemTypeDrive, url.type());
 
   base::FilePath file_path = util::ExtractDrivePathFromFileSystemUrl(url);
   // Hosted documents don't support stream writer.
   if (file_path.empty() || util::HasHostedDocumentExtension(file_path))
     return scoped_ptr<storage::FileStreamWriter>();
 
   return scoped_ptr<storage::FileStreamWriter>(
       new internal::WebkitFileStreamWriterImpl(
           base::Bind(&fileapi_internal::GetFileSystemFromUrl, url),
@@ skipping 12 matching lines @@
     const storage::FileSystemURL& url,
     const storage::URLCallback& callback) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   BrowserThread::PostTask(
       BrowserThread::UI,
       FROM_HERE,
       base::Bind(&GetRedirectURLForContentsOnUIThread, url, callback));
 }
 
 }  // namespace drive