Re-enable test QuicUnackedPacketMap::DebugString in wub's test branch.

quic/core/quic_unacked_packet_map_test.cc

diff --git a/quic/core/quic_unacked_packet_map_test.cc b/quic/core/quic_unacked_packet_map_test.cc
index 8a3d00b..4b598be 100644
--- a/quic/core/quic_unacked_packet_map_test.cc
+++ b/quic/core/quic_unacked_packet_map_test.cc
@@ -669,7 +669,7 @@
   ASSERT_EQ(QuicUnackedPacketMapPeer::GetCapacity(unacked_packets), 16u);
 }
 
-TEST_P(QuicUnackedPacketMapTest, QUIC_TEST_DISABLED_IN_CHROME(DebugString)) {
+TEST_P(QuicUnackedPacketMapTest, DebugString) {
   EXPECT_EQ(unacked_packets_.DebugString(),
             "{size: 0, least_unacked: 1, largest_sent_packet: uninitialized, "
             "largest_acked: uninitialized, bytes_in_flight: 0, "