Fix an issue that we didn't clean url request properly.

content/browser/download/download_item_impl.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.
 
 // File method ordering: Methods in this file are in the same order as
 // in download_item_impl.h, with the following exception: The public
 // interface Start is placed in chronological order with the other
 // (private) routines that together define a DownloadItem's state
 // transitions as the download progresses.  See "Download progression
 // cascade" later in this file.
@@ skipping 1043 matching lines @@
   content_disposition_ = new_create_info.content_disposition;
   // It is possible that the previous download attempt failed right before the
   // response is received. Need to reset the MIME type.
   mime_type_ = new_create_info.mime_type;
 
   // Don't update observers. This method is expected to be called just before a
   // DownloadFile is created and Start() is called. The observers will be
   // notified when the download transitions to the IN_PROGRESS state.
 }
 
+void DownloadItemImpl::CancelRequestWithOffset(int64_t offset) {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+  if (job_)
+    job_->CancelRequestWithOffset(offset);
+}
+
 void DownloadItemImpl::NotifyRemoved() {
   for (auto& observer : observers_)
     observer.OnDownloadRemoved(this);
 }
 
 void DownloadItemImpl::OnDownloadedFileRemoved() {
   file_externally_removed_ = true;
   DVLOG(20) << __func__ << "() download=" << DebugString(true);
   UpdateObservers();
 }
@@ skipping 232 matching lines @@
 }
 
 void DownloadItemImpl::StartDownload() {
   BrowserThread::PostTask(
       BrowserThread::FILE, FROM_HERE,
       base::Bind(&DownloadFile::Initialize,
                  // Safe because we control download file lifetime.
                  base::Unretained(download_file_.get()),
                  base::Bind(&DownloadItemImpl::OnDownloadFileInitialized,
                             weak_ptr_factory_.GetWeakPtr()),
+                 base::Bind(&DownloadItemImpl::CancelRequestWithOffset,
+                            weak_ptr_factory_.GetWeakPtr()),
                  received_slices_));
 }
 
 void DownloadItemImpl::OnDownloadFileInitialized(
     DownloadInterruptReason result) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   DCHECK(state_ == TARGET_PENDING_INTERNAL ||
          state_ == INTERRUPTED_TARGET_PENDING_INTERNAL)
       << "Unexpected state: " << DebugDownloadStateString(state_);
 
@@ skipping 938 matching lines @@
     case RESUME_MODE_USER_CONTINUE:
       return "USER_CONTINUE";
     case RESUME_MODE_USER_RESTART:
       return "USER_RESTART";
   }
   NOTREACHED() << "Unknown resume mode " << mode;
   return "unknown";
 }
 
 }  // namespace content