Clear the received slices in DownloadItemImpl when etag changed.

content/browser/download/download_file_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_FILE_IMPL_H_
 #define CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_FILE_IMPL_H_
 
 #include "content/browser/download/download_file.h"
 
 #include <stddef.h>
@@ skipping 29 matching lines @@
   // May be constructed on any thread.  All methods besides the constructor
   // (including destruction) must occur on the FILE thread.
   //
   // Note that the DownloadFileImpl automatically reads from the passed in
   // stream, and sends updates and status of those reads to the
   // DownloadDestinationObserver.
   DownloadFileImpl(
       std::unique_ptr<DownloadSaveInfo> save_info,
       const base::FilePath& default_downloads_directory,
       std::unique_ptr<ByteStreamReader> stream_reader,
-      const std::vector<DownloadItem::ReceivedSlice>& received_slices,
       const net::NetLogWithSource& net_log,
       base::WeakPtr<DownloadDestinationObserver> observer);
 
   ~DownloadFileImpl() override;
 
   // DownloadFile functions.
-  void Initialize(const InitializeCallback& callback) override;
+  void Initialize(const InitializeCallback& callback,
+                  const DownloadItem::ReceivedSlices& received_slices) override;
 
   void AddByteStream(std::unique_ptr<ByteStreamReader> stream_reader,
                      int64_t offset,
                      int64_t length) override;
 
   void RenameAndUniquify(const base::FilePath& full_path,
                          const RenameCompletionCallback& callback) override;
   void RenameAndAnnotate(const base::FilePath& full_path,
                          const std::string& client_guid,
                          const GURL& source_url,
@@ skipping 205 matching lines @@
 
   base::WeakPtr<DownloadDestinationObserver> observer_;
   base::WeakPtrFactory<DownloadFileImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadFileImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_FILE_IMPL_H_