Deprecate flag FLAGS_quic_sequencer_buffer_retire_block_in_time.

net/quic/core/quic_stream_sequencer_buffer.cc

Index: net/quic/core/quic_stream_sequencer_buffer.cc
diff --git a/net/quic/core/quic_stream_sequencer_buffer.cc b/net/quic/core/quic_stream_sequencer_buffer.cc
index c839e0795720cb4dadc9f183a187a2a5b33b8bdd..c761a625297078f36775d543d4e2602128394e4f 100644
--- a/net/quic/core/quic_stream_sequencer_buffer.cc
+++ b/net/quic/core/quic_stream_sequencer_buffer.cc
@@ -471,13 +471,9 @@ void QuicStreamSequencerBuffer::RetireBlockIfEmpty(size_t block_index) {
     DCHECK(first_gap.begin_offset == total_bytes_read_);
     // Check where the next piece data is.
     // Not empty if next piece of data is still in this chunk.
-    bool gap_extends_to_infinity =
-        (first_gap.end_offset == std::numeric_limits<QuicStreamOffset>::max());
     bool gap_ends_in_this_block =
         (GetBlockIndex(first_gap.end_offset) == block_index);
-    if ((!FLAGS_quic_sequencer_buffer_retire_block_in_time &&
-         !gap_extends_to_infinity) ||
-        gap_ends_in_this_block) {
+    if (gap_ends_in_this_block) {
       return;
     }
   }