Revert "Remove old serializer" It caused a regression, crbug.com/510422

public/web/WebPageSerializerClient.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 45 matching lines @@
         CurrentFrameIsNotFinished,
         CurrentFrameIsFinished,
         AllFramesAreFinished,
     };
 
     // Receive the individual chunks of serialized and encoded data to be saved.
     // The parameter frameURL specifies what frame the data belongs. The
     // parameter data contains the available data for saving. The parameter
     // status indicates the status of data serialization.
     virtual void didSerializeDataForFrame(const WebURL& frameURL,
-        const WebCString& data, PageSerializationStatus) = 0;
+                                          const WebCString& data,
+                                          PageSerializationStatus status) = 0;
     WebPageSerializerClient() { }
 
 protected:
     virtual ~WebPageSerializerClient() { }
 };
 
-} // namespace blink
+}  // namespace blink
 
 #endif