Reduce unnecessary download interruptions due to parallel requests

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 10 matching lines @@
 }
 
 void DownloadJob::Resume(bool resume_request) {
   is_paused_ = false;
 }
 
 void DownloadJob::StartDownload() const {
   download_item_->StartDownload();
 }
 
-void DownloadJob::Interrupt(DownloadInterruptReason reason) {
-  download_item_->InterruptAndDiscardPartialState(reason);
-  download_item_->UpdateObservers();
-}
-
 bool DownloadJob::AddByteStream(std::unique_ptr<ByteStreamReader> stream_reader,
                                 int64_t offset,
                                 int64_t length) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   DownloadFile* download_file = download_item_->download_file_.get();
   if (!download_file)
     return false;
 
   // 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::SetPotentialFileLength(int64_t length) {
-  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::SetPotentialFileLength,
-                   base::Unretained(download_file), length));
-  }
-}
-
 void DownloadJob::CancelRequestWithOffset(int64_t offset) {
   NOTREACHED();
 }
 
 bool DownloadJob::IsParallelizable() const {
   return false;
 }
 
 }  // namespace content