Pull new version of protobuf sources.

third_party/protobuf/CONTRIBUTORS.txt

 This file contains a list of people who have made large contributions
 to the public version of Protocol Buffers.
 
 Original Protocol Buffers design and implementation:
   Sanjay Ghemawat <sanjay@google.com>
   Jeff Dean <jeff@google.com>
   Daniel Dulitz <daniel@google.com>
   Craig Silverstein
   Paul Haahr <haahr@google.com>
   Corey Anderson <corin@google.com>
   (and many others)
 
 Proto2 C++ and Java primary author:
   Kenton Varda <kenton@google.com>
 
 Proto2 Python primary authors:
   Will Robinson <robinson@google.com>
   Petar Petrov <petar@google.com>
 
+Java Nano primary authors:
+  Brian Duff <bduff@google.com>
+  Tom Chao <chaot@google.com>
+  Max Cai <maxtroy@google.com>
+  Ulas Kirazci <ulas@google.com>
+
 Large code contributions:
   Jason Hsueh <jasonh@google.com>
   Joseph Schorr <jschorr@google.com>
   Wenbo Zhu <wenboz@google.com>
 
 Large quantity of code reviews:
   Scott Bruce <sbruce@google.com>
   Frank Yellin
   Neal Norwitz <nnorwitz@google.com>
   Jeffrey Yasskin <jyasskin@google.com>
@@ skipping 13 matching lines @@
   Ulrich Kunitz <kune@deine-taler.de>
     * Small optimizations to Python serialization.
   Leandro Lucarella <llucax@gmail.com>
     * VI syntax highlighting tweaks.
     * Fix compiler to not make output executable.
   Dilip Joseph <dilip.antony.joseph@gmail.com>
     * Heuristic detection of sub-messages when printing unknown fields in
       text format.
   Brian Atkinson <nairb774@gmail.com>
     * Added @Override annotation to generated Java code where appropriate.
-  Vincent Choinière <Choiniere.Vincent@hydro.qc.ca>
+  Vincent Choinière <Choiniere.Vincent@hydro.qc.ca>
     * Tru64 support.
   Monty Taylor <monty.taylor@gmail.com>
     * Solaris 10 + Sun Studio fixes.
   Alek Storm <alek.storm@gmail.com>
     * Slicing support for repeated scalar fields for the Python API.
   Oleg Smolsky <oleg.smolsky@gmail.com>
     * MS Visual Studio error format option.
     * Detect unordered_map in stl_hash.m4.
   Brian Olson <brianolson@google.com>
     * gzip/zlib I/O support.
@@ skipping 15 matching lines @@
     * Detect whether zlib is new enough in configure script.
     * Fixes for Solaris 10 32/64-bit confusion.
   Evan Jones <evanj@mit.edu>
     * Optimize Java serialization code when writing a small message to a stream.
     * Optimize Java serialization of strings so that UTF-8 encoding happens only
       once per string per serialization call.
     * Clean up some Java warnings.
     * Fix bug with permanent callbacks that delete themselves when run.
   Michael Kucharski <m.kucharski@gmail.com>
     * Added CodedInputStream.getTotalBytesRead().
+  Kacper Kowalik <xarthisius.kk@gmail.com>
+    * Fixed m4/acx_pthread.m4 problem for some Linux distributions.
+  William Orr <will@worrbase.com>
+    * Fixed detection of sched_yield on Solaris.
+    * Added atomicops for Solaris
+  Andrew Paprocki <andrew@ishiboo.com>
+    * Fixed minor IBM xlC compiler build issues
+    * Added atomicops for AIX (POWER)