(n/a) remove final specifier from QuicBatchWriterBase::Flush() interface.

This is to make it overridable in Envoy

PiperOrigin-RevId: 325099102
Change-Id: If30ac01cb4fb09a5d7a84f60ce5311d8fbae01e3

quic/core/batch_writer/quic_batch_writer_base.h

diff --git a/quic/core/batch_writer/quic_batch_writer_base.h b/quic/core/batch_writer/quic_batch_writer_base.h
index 2723f55..b902677 100644
--- a/quic/core/batch_writer/quic_batch_writer_base.h
+++ b/quic/core/batch_writer/quic_batch_writer_base.h
@@ -54,7 +54,7 @@
     return {batch_buffer_->GetNextWriteLocation(), nullptr};
   }
 
-  WriteResult Flush() final;
+  WriteResult Flush() override;
 
  protected:
   const QuicBatchWriterBuffer& batch_buffer() const { return *batch_buffer_; }