Rename QuicDataStream to QuicSpdyStream. No behavior change.

net/tools/quic/quic_server_session.cc

Index: net/tools/quic/quic_server_session.cc
diff --git a/net/tools/quic/quic_server_session.cc b/net/tools/quic/quic_server_session.cc
index cca2bb8d9ca75baf1033996f79f2c370e83d0733..33d7cefac25556582f2250c62f454c423e301b9e 100644
--- a/net/tools/quic/quic_server_session.cc
+++ b/net/tools/quic/quic_server_session.cc
@@ -196,7 +196,7 @@ bool QuicServerSession::ShouldCreateIncomingDynamicStream(QuicStreamId id) {
   return true;
 }
 
-QuicDataStream* QuicServerSession::CreateIncomingDynamicStream(
+QuicSpdyStream* QuicServerSession::CreateIncomingDynamicStream(
     QuicStreamId id) {
   if (!ShouldCreateIncomingDynamicStream(id)) {
     return nullptr;
@@ -205,7 +205,7 @@ QuicDataStream* QuicServerSession::CreateIncomingDynamicStream(
   return new QuicSpdyServerStream(id, this);
 }
 
-QuicDataStream* QuicServerSession::CreateOutgoingDynamicStream() {
+QuicSpdyStream* QuicServerSession::CreateOutgoingDynamicStream() {
   DLOG(ERROR) << "Server push not yet supported";
   return nullptr;
 }