Upgrade liblouis to 2.6.0.

third_party/liblouis/liblouis_nacl.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.
 
 {
   'variables': {
     'braille_test_data_dir': '<(PRODUCT_DIR)/chromevox_test_data/braille',
     'braille_chromevox_dir': '<(PRODUCT_DIR)/resources/chromeos/chromevox/chromevox/background/braille',
     'table_files': [
       '>!@pymod_do_main(liblouis_list_tables -D overrides/tables -D src/tables tables.json)',
@@ skipping 39 matching lines @@
             '.',
           ],
           'direct_dependent_settings': {
             'include_dirs': [
               'overrides',
             ],
           },
           'sources': [
             'overrides/liblouis/config.h',
             'overrides/liblouis/liblouis.h',
-            'overrides/liblouis/compileTranslationTable.c',
+            'src/liblouis/compileTranslationTable.c',
+            'src/liblouis/logging.c',
             'src/liblouis/lou_backTranslateString.c',
             'src/liblouis/lou_translateString.c',
             'src/liblouis/transcommon.ci',
             'src/liblouis/wrappers.c',
           ],
           'dependencies': [
             '../../native_client/tools.gyp:prep_toolchain',
           ],
         },
         {
@@ skipping 110 matching lines @@
               'files': [
                 '<@(table_files)',
               ],
             },
           ],
         },
       ],
     }],
   ],
 }