Fix a QuicStreamSequencerBuffer logging issue caused by inapproriate itoa function.

net/quic/quic_stream_sequencer_buffer.cc

 // Copyright (c) 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/quic/quic_stream_sequencer_buffer.h"
 
 #include "base/logging.h"
 #include "base/strings/string_number_conversions.h"
 #include "net/quic/quic_bug_tracker.h"
 
 using std::min;
 using std::string;
 
 namespace net {
 
 namespace {
 
 string RangeDebugString(QuicStreamOffset start, QuicStreamOffset end) {
-  return string("[") + base::IntToString(start) + ", " +
-         base::IntToString(end) + ") ";
+  return string("[") + base::Uint64ToString(start) + ", " +
+         base::Uint64ToString(end) + ") ";
 }
 
 }  // namespace
 
 QuicStreamSequencerBuffer::Gap::Gap(QuicStreamOffset begin_offset,
                                     QuicStreamOffset end_offset)
     : begin_offset(begin_offset), end_offset(end_offset) {}
 
 QuicStreamSequencerBuffer::FrameInfo::FrameInfo()
     : length(1), timestamp(QuicTime::Zero()) {}
@@ skipping 470 matching lines @@
     QuicStreamOffset current_frame_begin_offset = it.first;
     QuicStreamOffset current_frame_end_offset =
         it.second.length + current_frame_begin_offset;
     current_frames_string +=
         RangeDebugString(current_frame_begin_offset, current_frame_end_offset);
   }
   return current_frames_string;
 }
 
 }  //  namespace net