remove is_sparse_file_ from DownloadFileImpl

content/browser/download/base_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/base_file.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/files/file.h"
@@ skipping 91 matching lines @@
 
   net_log_.BeginEvent(net::NetLogEventType::DOWNLOAD_FILE_WRITTEN);
   int write_result = file_.Write(offset, data, data_len);
   DCHECK_NE(0, write_result);
 
   // Report errors on file writes.
   if (write_result < 0)
     return LogSystemError("Write", logging::GetLastSystemErrorCode());
 
   DCHECK_EQ(static_cast<size_t>(write_result), data_len);
+
+  if (bytes_so_far_ != offset) {
+    // A hole is created in the file.
+    is_sparse_file_ = true;
+    secure_hash_.reset();
+  }
+
   bytes_so_far_ += data_len;
   net_log_.EndEvent(net::NetLogEventType::DOWNLOAD_FILE_WRITTEN,
                     net::NetLog::Int64Callback("bytes", data_len));
 
   if (secure_hash_)
     secure_hash_->Update(data, data_len);
 
   return DOWNLOAD_INTERRUPT_REASON_NONE;
 }
 
@@ skipping 344 matching lines @@
 #else  // !OS_WIN && !OS_MACOSX && !OS_LINUX
 DownloadInterruptReason BaseFile::AnnotateWithSourceInformation(
     const std::string& client_guid,
     const GURL& source_url,
     const GURL& referrer_url) {
   return DOWNLOAD_INTERRUPT_REASON_NONE;
 }
 #endif
 
 }  // namespace content