Disable QUIC v29 and earlier. Protected by FLAGS_quic_disable_pre_30.

net/quic/quic_protocol_test.cc

Index: net/quic/quic_protocol_test.cc
diff --git a/net/quic/quic_protocol_test.cc b/net/quic/quic_protocol_test.cc
index 393702da325dbd9e9dcacbef8197b4e959f668f4..64ac0956eee3e3a1687cab5f9282af8e5b3a3434 100644
--- a/net/quic/quic_protocol_test.cc
+++ b/net/quic/quic_protocol_test.cc
@@ -7,6 +7,7 @@
 #include <sstream>
 
 #include "base/stl_util.h"
+#include "net/quic/quic_flags.h"
 #include "net/quic/quic_utils.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ -282,6 +283,17 @@ TEST(QuicProtocolTest, PathCloseFrameToString) {
   EXPECT_EQ("{ path_id: 1 }\n", stream.str());
 }
 
+TEST(QuicProtocolTest, FilterSupportedVersions) {
+  QuicVersionVector all_versions = {QUIC_VERSION_25, QUIC_VERSION_26,
+                                    QUIC_VERSION_27, QUIC_VERSION_29,
+                                    QUIC_VERSION_30};
+
+  FLAGS_quic_disable_pre_30 = true;
+  QuicVersionVector filtered_versions = FilterSupportedVersions(all_versions);
+  ASSERT_EQ(1u, filtered_versions.size());
+  EXPECT_EQ(QUIC_VERSION_30, filtered_versions[0]);
+}
+
 // Tests that a queue contains the expected data after calls to Add().
 TEST(PacketNumberQueueTest, AddRange) {
   PacketNumberQueue queue;