Update GN files w/ changes needed to make sanitizers work.

tools/mb/mb_config.pyl

 # Copyright 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.
 
 {
   # This is a map of buildbot master names -> buildbot builder names ->
   # config names (where each config name is a key in the 'configs' dict,
   # below). MB uses this dict to look up which config to use for a given bot.
   'masters': {
     # Take care when changing any of these builders to ensure that you do not
@@ skipping 2203 matching lines @@
       'gn_args': 'is_component_build=false',
       'gyp_defines': 'component=static_library',
     },
 
     'swarming': {
       'gn_args': '',
       'gyp_defines': 'test_isolation_mode=prepare',
     },
 
     'symbolized': {
-      'gn_args': 'error', # TODO(GYP): add an equivalent flag for this
+      'gn_args': 'symbolized=true',
       'gyp_defines':
         'release_extra_cflags="-O1 -fno-inline-functions -fno-inline"',
     },
 
     'syzyasan': {
       'gn_args': 'is_syzyasan=true',
       'gyp_defines': 'syzyasan=1'
     },
 
     'tsan': {
@@ skipping 50 matching lines @@
     },
 
     'drfuzz': { 'gn_args': 'use_drfuzz=true' },
 
     'drmemory': {
       'gn_args': 'is_component_build=true enable_iterator_debugging=false',
       'gyp_defines': 'component=shared_library build_for_tool=drmemory',
     },
   },
 }