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/quic_stream_test.cc b/quic/core/quic_stream_test.cc
index e68ed58..ba21608 100644
--- a/quic/core/quic_stream_test.cc
+++ b/quic/core/quic_stream_test.cc
@@ -517,9 +517,8 @@
   QuicWindowUpdateFrame window_update_1(kInvalidControlFrameId, stream_->id(),
                                         kMinimumFlowControlSendWindow + 5);
   stream_->OnWindowUpdateFrame(window_update_1);
-  EXPECT_EQ(
-      window_update_1.byte_offset,
-      QuicFlowControllerPeer::SendWindowOffset(stream_->flow_controller()));
+  EXPECT_EQ(window_update_1.max_data, QuicFlowControllerPeer::SendWindowOffset(
+                                          stream_->flow_controller()));
 
   // Now send a few more WINDOW_UPDATES and make sure that only the largest is
   // remembered.
@@ -532,9 +531,8 @@
   stream_->OnWindowUpdateFrame(window_update_2);
   stream_->OnWindowUpdateFrame(window_update_3);
   stream_->OnWindowUpdateFrame(window_update_4);
-  EXPECT_EQ(
-      window_update_3.byte_offset,
-      QuicFlowControllerPeer::SendWindowOffset(stream_->flow_controller()));
+  EXPECT_EQ(window_update_3.max_data, QuicFlowControllerPeer::SendWindowOffset(
+                                          stream_->flow_controller()));
 }
 
 TEST_P(QuicStreamTest, FrameStats) {