Clear the received slices in DownloadItemImpl when etag changed.

content/browser/download/download_file_impl.h

Index: content/browser/download/download_file_impl.h
diff --git a/content/browser/download/download_file_impl.h b/content/browser/download/download_file_impl.h
index 0a2cbd832993f36e25d42e619712bd0b48046a84..b3ce7d9259c8a57f2af114e9ef1ed22edc93719b 100644
--- a/content/browser/download/download_file_impl.h
+++ b/content/browser/download/download_file_impl.h
@@ -47,14 +47,14 @@ class CONTENT_EXPORT DownloadFileImpl : public DownloadFile {
       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,