diff --git a/quic/core/quic_stream_sequencer_buffer.cc b/quic/core/quic_stream_sequencer_buffer.cc
index ec3b49f..8a26521 100644
--- a/quic/core/quic_stream_sequencer_buffer.cc
+++ b/quic/core/quic_stream_sequencer_buffer.cc
@@ -55,14 +55,14 @@
   bytes_received_.Add(0, total_bytes_read_);
 }
 
-bool QuicStreamSequencerBuffer::RetireBlock(size_t idx) {
-  if (blocks_[idx] == nullptr) {
+bool QuicStreamSequencerBuffer::RetireBlock(size_t index) {
+  if (blocks_[index] == nullptr) {
     QUIC_BUG << "Try to retire block twice";
     return false;
   }
-  delete blocks_[idx];
-  blocks_[idx] = nullptr;
-  QUIC_DVLOG(1) << "Retired block with index: " << idx;
+  delete blocks_[index];
+  blocks_[index] = nullptr;
+  QUIC_DVLOG(1) << "Retired block with index: " << index;
   return true;
 }
 
@@ -198,8 +198,8 @@
           "QuicStreamSequencerBuffer error: OnStreamData()"
           " dest == nullptr: ",
           (dest == nullptr), " source == nullptr: ", (source == nullptr),
-          " Writing at offset ", offset, " Gaps: ", GapsDebugString(),
-          " Remaining frames: ", ReceivedFramesDebugString(),
+          " Writing at offset ", offset,
+          " Received frames: ", ReceivedFramesDebugString(),
           " total_bytes_read_ = ", total_bytes_read_);
       return false;
     }
@@ -236,8 +236,7 @@
             " Readv() dest == nullptr: ",
             (dest == nullptr), " blocks_[", block_idx,
             "] == nullptr: ", (blocks_[block_idx] == nullptr),
-            " Gaps: ", GapsDebugString(),
-            " Remaining frames: ", ReceivedFramesDebugString(),
+            " Received frames: ", ReceivedFramesDebugString(),
             " total_bytes_read_ = ", total_bytes_read_);
         return QUIC_STREAM_SEQUENCER_INVALID_STATE;
       }
@@ -260,7 +259,8 @@
               "QuicStreamSequencerBuffer error: fail to retire block ",
               block_idx,
               " as the block is already released, total_bytes_read_ = ",
-              total_bytes_read_, " Gaps: ", GapsDebugString());
+              total_bytes_read_,
+              " Received frames: ", ReceivedFramesDebugString());
           return QUIC_STREAM_SEQUENCER_INVALID_STATE;
         }
       }
@@ -271,9 +271,9 @@
 }
 
 int QuicStreamSequencerBuffer::GetReadableRegions(struct iovec* iov,
-                                                  int iov_count) const {
+                                                  int iov_len) const {
   DCHECK(iov != nullptr);
-  DCHECK_GT(iov_count, 0);
+  DCHECK_GT(iov_len, 0);
 
   if (ReadableBytes() == 0) {
     iov[0].iov_base = nullptr;
@@ -308,7 +308,7 @@
   // a region.
   int iov_used = 1;
   size_t block_idx = (start_block_idx + iov_used) % blocks_count_;
-  while (block_idx != end_block_idx && iov_used < iov_count) {
+  while (block_idx != end_block_idx && iov_used < iov_len) {
     DCHECK(nullptr != blocks_[block_idx]);
     iov[iov_used].iov_base = blocks_[block_idx]->buffer;
     iov[iov_used].iov_len = GetBlockCapacity(block_idx);
@@ -318,7 +318,7 @@
   }
 
   // Deal with last block if |iov| can hold more.
-  if (iov_used < iov_count) {
+  if (iov_used < iov_len) {
     DCHECK(nullptr != blocks_[block_idx]);
     iov[iov_used].iov_base = blocks_[end_block_idx]->buffer;
     iov[iov_used].iov_len = end_block_offset + 1;
@@ -364,11 +364,11 @@
   return true;
 }
 
-bool QuicStreamSequencerBuffer::MarkConsumed(size_t bytes_used) {
-  if (bytes_used > ReadableBytes()) {
+bool QuicStreamSequencerBuffer::MarkConsumed(size_t bytes_consumed) {
+  if (bytes_consumed > ReadableBytes()) {
     return false;
   }
-  size_t bytes_to_consume = bytes_used;
+  size_t bytes_to_consume = bytes_consumed;
   while (bytes_to_consume > 0) {
     size_t block_idx = NextBlockToRead();
     size_t offset_in_block = ReadOffset();
@@ -483,11 +483,6 @@
   }
 }
 
-std::string QuicStreamSequencerBuffer::GapsDebugString() const {
-  // TODO(vasilvv): this should return the complement of |bytes_received_|.
-  return bytes_received_.ToString();
-}
-
 std::string QuicStreamSequencerBuffer::ReceivedFramesDebugString() const {
   return bytes_received_.ToString();
 }
diff --git a/quic/core/quic_stream_sequencer_buffer.h b/quic/core/quic_stream_sequencer_buffer.h
index babf3c8..356b62f 100644
--- a/quic/core/quic_stream_sequencer_buffer.h
+++ b/quic/core/quic_stream_sequencer_buffer.h
@@ -137,10 +137,10 @@
   // Does not consume data.
   bool PeekRegion(QuicStreamOffset offset, iovec* iov) const;
 
-  // Called after GetReadableRegions() to free up |bytes_used| space if these
-  // bytes are processed.
-  // Pre-requisite: bytes_used <= available bytes to read.
-  bool MarkConsumed(size_t bytes_buffered);
+  // Called after GetReadableRegions() to free up |bytes_consumed| space if
+  // these bytes are processed.
+  // Pre-requisite: bytes_consumed <= available bytes to read.
+  bool MarkConsumed(size_t bytes_consumed);
 
   // Deletes and records as consumed any buffered data and clear the buffer.
   // (To be called only after sequencer's StopReading has been called.)
@@ -208,10 +208,7 @@
   // Returns offset of highest received byte + 1.
   QuicStreamOffset NextExpectedByte() const;
 
-  // Return |gaps_| as a string: [1024, 1500) [1800, 2048)... for debugging.
-  std::string GapsDebugString() const;
-
-  // Return all received frames as a string in same format as GapsDebugString();
+  // Return all received frames as a string.
   std::string ReceivedFramesDebugString() const;
 
   // The maximum total capacity of this buffer in byte, as constructed.