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

content/browser/download/download_item_impl.h

 // 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.
 
 #ifndef CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_ITEM_IMPL_H_
 #define CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_ITEM_IMPL_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 489 matching lines @@
   void AutoResumeIfValid();
 
   enum class ResumptionRequestSource { AUTOMATIC, USER };
   void ResumeInterruptedDownload(ResumptionRequestSource source);
 
   // Update origin information based on the response to a download resumption
   // request. Should only be called if the resumption request was successful.
   virtual void UpdateValidatorsOnResumption(
       const DownloadCreateInfo& new_create_info);
 
+  // Cancel a particular request that starts from |offset|.
+  void CancelRequestWithOffset(int64_t offset);
+
   static DownloadState InternalToExternalState(
       DownloadInternalState internal_state);
   static DownloadInternalState ExternalToInternalState(
       DownloadState external_state);
 
   // Debugging routines --------------------------------------------------------
   static const char* DebugDownloadStateString(DownloadInternalState state);
   static const char* DebugResumeModeString(ResumeMode mode);
   static bool IsValidSavePackageStateTransition(DownloadInternalState from,
                                                 DownloadInternalState to);
@@ skipping 191 matching lines @@
   std::unique_ptr<DownloadJob> job_;
 
   base::WeakPtrFactory<DownloadItemImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadItemImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_ITEM_IMPL_H_