Change window_update frame's byte_offset to max_data to incorporate IETF spec.

https://tools.ietf.org/html/draft-ietf-quic-transport-24#section-19.10

gfe-relnote: name change only. Not protected.
PiperOrigin-RevId: 281838511
Change-Id: I716cfd6856d8c9dd9981040f68bc0567feaedaee
diff --git a/quic/core/frames/quic_window_update_frame.cc b/quic/core/frames/quic_window_update_frame.cc
index 07e3168..81ca125 100644
--- a/quic/core/frames/quic_window_update_frame.cc
+++ b/quic/core/frames/quic_window_update_frame.cc
@@ -13,16 +13,16 @@
 QuicWindowUpdateFrame::QuicWindowUpdateFrame(
     QuicControlFrameId control_frame_id,
     QuicStreamId stream_id,
-    QuicStreamOffset byte_offset)
+    QuicByteCount max_data)
     : control_frame_id(control_frame_id),
       stream_id(stream_id),
-      byte_offset(byte_offset) {}
+      max_data(max_data) {}
 
 std::ostream& operator<<(std::ostream& os,
                          const QuicWindowUpdateFrame& window_update_frame) {
   os << "{ control_frame_id: " << window_update_frame.control_frame_id
      << ", stream_id: " << window_update_frame.stream_id
-     << ", byte_offset: " << window_update_frame.byte_offset << " }\n";
+     << ", max_data: " << window_update_frame.max_data << " }\n";
   return os;
 }