set content length limit if half open range request fails

content/browser/download/download_job.cc

 // Copyright 2017 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/download_job.h"
 
 #include "base/bind_helpers.h"
 #include "content/browser/download/download_file.h"
 #include "content/browser/download/download_item_impl.h"
 #include "content/public/browser/browser_thread.h"
@@ skipping 33 matching lines @@
   // download_file_ is owned by download_item_ on the UI thread and is always
   // deleted on the FILE thread after download_file_ is nulled out.
   // So it's safe to use base::Unretained here.
   BrowserThread::PostTask(
       BrowserThread::FILE, FROM_HERE,
       base::Bind(&DownloadFile::AddByteStream, base::Unretained(download_file),
                  base::Passed(&stream_reader), offset, length));
   return true;
 }
 
+void DownloadJob::SetContentLengthLimit(int64_t limit) {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+  DownloadFile* download_file = download_item_->download_file_.get();
+  if (download_file) {
+    BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE,
+                            base::Bind(&DownloadFile::SetContentLengthLimit,
+                                       base::Unretained(download_file), limit));
+  }
+}
+
 bool DownloadJob::UsesParallelRequests() const {
   return false;
 }
 
 }  // namespace content