In quicsession, unify num_*_incoming_streams_ and num_*_outgoing_streams_. refactoring only, not protected.

Also remove unused GetNumDrainingStreams, GetNumOpenDynamicStreams and GetNumDrainingOutgoingStreams.

PiperOrigin-RevId: 314332362
Change-Id: Iccbc9cdf1bc7c2c5101de7de31d68a218e7d0901
diff --git a/quic/core/quic_stream_test.cc b/quic/core/quic_stream_test.cc
index 700931c..62ffae8 100644
--- a/quic/core/quic_stream_test.cc
+++ b/quic/core/quic_stream_test.cc
@@ -750,7 +750,7 @@
                              nullptr);
   EXPECT_TRUE(stream_->write_side_closed());
 
-  EXPECT_EQ(1u, session_->GetNumDrainingStreams());
+  EXPECT_EQ(1u, QuicSessionPeer::GetNumDrainingStreams(session_.get()));
   EXPECT_EQ(0u, QuicSessionPeer::GetNumOpenDynamicStreams(session_.get()));
 }
 
@@ -778,7 +778,7 @@
   EXPECT_FALSE(QuicStreamPeer::read_side_closed(stream_));
   EXPECT_FALSE(stream_->reading_stopped());
 
-  EXPECT_EQ(1u, session_->GetNumDrainingStreams());
+  EXPECT_EQ(1u, QuicSessionPeer::GetNumDrainingStreams(session_.get()));
   EXPECT_EQ(0u, QuicSessionPeer::GetNumOpenDynamicStreams(session_.get()));
 }