Clear the received slices in DownloadItemImpl when etag changed.

content/browser/download/download_manager_impl.cc

Index: content/browser/download/download_manager_impl.cc
diff --git a/content/browser/download/download_manager_impl.cc b/content/browser/download/download_manager_impl.cc
index ff6459014be447783ec6f60edf40a6f0ffa09385..a90257c8e0af56dd87aeb2447dab1f430d6c6cfe 100644
--- a/content/browser/download/download_manager_impl.cc
+++ b/content/browser/download/download_manager_impl.cc
@@ -371,8 +371,7 @@ void DownloadManagerImpl::StartDownloadWithId(
     DCHECK(stream.get());
     download_file.reset(file_factory_->CreateFile(
         std::move(info->save_info), default_download_directory,
-        std::move(stream), download->GetReceivedSlices(),
-        download->GetNetLogWithSource(),
+        std::move(stream), download->GetNetLogWithSource(),
         download->DestinationObserverAsWeakPtr()));
   }
   // It is important to leave info->save_info intact in the case of an interrupt