Refactor BaseFile class to support sparse files

content/browser/download/save_file.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 "content/browser/download/save_file.h"
 
 #include "base/logging.h"
 #include "content/public/browser/browser_thread.h"
 #include "net/log/net_log_with_source.h"
 
@@ skipping 10 matching lines @@
   DCHECK(info);
   DCHECK(info->path.empty());
 }
 
 SaveFile::~SaveFile() {
   DCHECK_CURRENTLY_ON(BrowserThread::FILE);
 }
 
 DownloadInterruptReason SaveFile::Initialize() {
   return file_.Initialize(base::FilePath(), base::FilePath(), base::File(), 0,
-                          std::string(), std::unique_ptr<crypto::SecureHash>());
+                          std::string(), std::unique_ptr<crypto::SecureHash>(),
+                          false);
 }
 
 DownloadInterruptReason SaveFile::AppendDataToFile(const char* data,
                                                    size_t data_len) {
   return file_.AppendDataToFile(data, data_len);
 }
 
 DownloadInterruptReason SaveFile::Rename(const base::FilePath& full_path) {
   return file_.Rename(full_path);
 }
@@ skipping 26 matching lines @@
 
 int64_t SaveFile::BytesSoFar() const {
   return file_.bytes_so_far();
 }
 
 std::string SaveFile::DebugString() const {
   return file_.DebugString();
 }
 
 }  // namespace content