Remove PathCloseFrame, QuicPathId, DefaultPathId and InvalidPathId.

net/quic/test_tools/quic_test_utils.cc

Index: net/quic/test_tools/quic_test_utils.cc
diff --git a/net/quic/test_tools/quic_test_utils.cc b/net/quic/test_tools/quic_test_utils.cc
index 1ef7a6e758a071342f9befccb31e4c51ee44bd5e..adf9df17a83ffa67fd21bf8cc8c47c1dcb40a40b 100644
--- a/net/quic/test_tools/quic_test_utils.cc
+++ b/net/quic/test_tools/quic_test_utils.cc
@@ -221,10 +221,6 @@ bool NoOpFramerVisitor::OnBlockedFrame(const QuicBlockedFrame& frame) {
   return true;
 }
 
-bool NoOpFramerVisitor::OnPathCloseFrame(const QuicPathCloseFrame& frame) {
-  return true;
-}
-
 MockQuicConnectionVisitor::MockQuicConnectionVisitor() {}
 
 MockQuicConnectionVisitor::~MockQuicConnectionVisitor() {}