Revert of Update re2

third_party/re2/re2.gyp

 # Copyright 2014 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.
 
 {
   'targets': [
     {
       'target_name': 're2',
       'type': 'static_library',
       'include_dirs': [
@@ skipping 26 matching lines @@
         're2/prefilter_tree.h',
         're2/prog.cc',
         're2/prog.h',
         're2/re2.cc',
         're2/re2.h',
         're2/regexp.cc',
         're2/regexp.h',
         're2/set.cc',
         're2/set.h',
         're2/simplify.cc',
-        're2/stringpiece.cc',
         're2/stringpiece.h',
         're2/tostring.cc',
         're2/unicode_casefold.cc',
         're2/unicode_casefold.h',
         're2/unicode_groups.cc',
         're2/unicode_groups.h',
         're2/variadic_function.h',
         're2/walker-inl.h',
+        'util/arena.cc',
+        'util/arena.h',
         'util/atomicops.h',
         'util/flags.h',
         'util/hash.cc',
-        'util/logging.cc',
         'util/logging.h',
         'util/mutex.h',
         'util/rune.cc',
         'util/sparse_array.h',
         'util/sparse_set.h',
+        'util/stringpiece.cc',
         'util/stringprintf.cc',
         'util/strutil.cc',
         'util/utf.h',
         'util/util.h',
-        'util/valgrind.cc',
-        'util/valgrind.h',
       ],
       'conditions': [
         ['OS=="win"', {
           'msvs_disabled_warnings': [ 4018, 4722, 4267 ],
         }]
       ]
     },
   ],
 }