Deprecate FLAGS_quic_stream_sequencer_buffer_debug.

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 fcb617fb61d9d79d912ccf846b76e153c4b9fdd2..63f386f78071693c4836164fb6bc0753da7d9c98 100644
--- a/net/quic/core/quic_stream_sequencer_buffer.cc
+++ b/net/quic/core/quic_stream_sequencer_buffer.cc
@@ -80,7 +80,7 @@ void QuicStreamSequencerBuffer::Clear() {
 }
 
 bool QuicStreamSequencerBuffer::RetireBlock(size_t idx) {
-  if (FLAGS_quic_stream_sequencer_buffer_debug && blocks_[idx] == nullptr) {
+  if (blocks_[idx] == nullptr) {
     QUIC_BUG << "Try to retire block twice";
     return false;
   }
@@ -188,8 +188,7 @@ QuicErrorCode QuicStreamSequencerBuffer::OnStreamData(
       }
     }
 
-    if (FLAGS_quic_stream_sequencer_buffer_debug &&
-        write_block_num >= blocks_count_) {
+    if (write_block_num >= blocks_count_) {
       *error_details = StringPrintf(
           "QuicStreamSequencerBuffer error: OnStreamData() exceed array bounds."
           "write offset = %" PRIu64 " write_block_num = %" PRIuS
@@ -212,8 +211,7 @@ QuicErrorCode QuicStreamSequencerBuffer::OnStreamData(
     char* dest = blocks_[write_block_num]->buffer + write_block_offset;
     DVLOG(1) << "Write at offset: " << offset << " length: " << bytes_to_copy;
 
-    if (FLAGS_quic_stream_sequencer_buffer_debug &&
-        (dest == nullptr || source == nullptr)) {
+    if (dest == nullptr || source == nullptr) {
       *error_details = StringPrintf(
           "QuicStreamSequencerBuffer error: OnStreamData()"
           " dest == nullptr: %s"
@@ -292,8 +290,7 @@ QuicErrorCode QuicStreamSequencerBuffer::Readv(const iovec* dest_iov,
       size_t bytes_to_copy =
           min<size_t>(bytes_available_in_block, dest_remaining);
       DCHECK_GT(bytes_to_copy, 0UL);
-      if (FLAGS_quic_stream_sequencer_buffer_debug &&
-          (blocks_[block_idx] == nullptr || dest == nullptr)) {
+      if (blocks_[block_idx] == nullptr || dest == nullptr) {
         *error_details = StringPrintf(
             "QuicStreamSequencerBuffer error:"
             " Readv() dest == nullptr: %s"
@@ -316,7 +313,7 @@ QuicErrorCode QuicStreamSequencerBuffer::Readv(const iovec* dest_iov,
       // immediately.
       if (bytes_to_copy == bytes_available_in_block) {
         bool retire_successfully = RetireBlockIfEmpty(block_idx);
-        if (FLAGS_quic_stream_sequencer_buffer_debug && !retire_successfully) {
+        if (!retire_successfully) {
           *error_details = StringPrintf(
               "QuicStreamSequencerBuffer error: fail to retire block %" PRIuS
               " as the block is already released + total_bytes_read_ = %" PRIu64
@@ -592,16 +589,9 @@ string QuicStreamSequencerBuffer::ReceivedFramesDebugString() {
     QuicStreamOffset current_frame_begin_offset = it.first;
     QuicStreamOffset current_frame_end_offset =
         it.second.length + current_frame_begin_offset;
-    if (FLAGS_quic_stream_sequencer_buffer_debug) {
-      current_frames_string = string(StringPrintf(
-          "%s[%" PRIu64 ", %" PRIu64 ") receiving time %" PRId64 " ",
-          current_frames_string.c_str(), current_frame_begin_offset,
-          current_frame_end_offset, it.second.timestamp.ToDebuggingValue()));
-    } else {
-      current_frames_string = string(StringPrintf(
-          "%s[%" PRIu64 ", %" PRIu64 ") ", current_frames_string.c_str(),
-          current_frame_begin_offset, current_frame_end_offset));
-    }
+    current_frames_string = string(StringPrintf(
+        "%s[%" PRIu64 ", %" PRIu64 ") ", current_frames_string.c_str(),
+        current_frame_begin_offset, current_frame_end_offset));
   }
   return current_frames_string;
 }