Do not use |target_os="chromeos"| for libFuzzer and AFL build configurations.

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': {
     'chromeos.chrome': {
@@ skipping 1212 matching lines @@
 
     'gn_debug_bot': [
       'gn', 'debug_bot',
     ],
 
     'gn_debug_bot_minimal_symbols_x86': [
       'gn', 'debug_bot_minimal_symbols', 'x86',
     ],
 
     'gn_debug_libfuzzer_asan': [
-      'gn', 'debug', 'libfuzzer', 'asan', 'chromeos_with_codecs', 'pdf_xfa',
+      'gn', 'debug', 'libfuzzer', 'asan', 'chromeos_codecs', 'pdf_xfa',
       'disable_nacl',
     ],
 
     'gn_linux_upload': [
       'gn_linux_upload', 'official', 'goma',
     ],
 
     'gn_official': [
       'gn', 'official',
     ],
@@ skipping 60 matching lines @@
 
     'gn_release_drmemory_drfuzz': [
       'gn', 'release', 'drmemory', 'drfuzz', 'chrome_with_codecs',
     ],
 
     'gn_release_drmemory_drfuzz_x86': [
       'gn', 'release', 'drmemory', 'drfuzz', 'x86', 'chrome_with_codecs',
      ],
 
     'gn_release_afl_asan': [
-      'gn', 'release', 'afl', 'asan', 'chromeos_with_codecs', 'pdf_xfa',
+      'gn', 'release', 'afl', 'asan', 'chromeos_codecs', 'pdf_xfa',
       'disable_nacl',
     ],
 
     'gn_release_libfuzzer_mac_asan': [
       'gn', 'release', 'libfuzzer', 'asan', 'chrome_with_codecs', 'pdf_xfa',
       'disable_nacl',
     ],
 
     'gn_release_libfuzzer_asan': [
-      'gn', 'release', 'libfuzzer', 'asan', 'chromeos_with_codecs', 'pdf_xfa',
+      'gn', 'release', 'libfuzzer', 'asan', 'chromeos_codecs', 'pdf_xfa',
       'disable_nacl',
     ],
 
     'gn_release_libfuzzer_msan': [
-      'gn', 'release', 'libfuzzer', 'msan', 'chromeos_with_codecs', 'pdf_xfa',
+      'gn', 'release', 'libfuzzer', 'msan', 'chromeos_codecs', 'pdf_xfa',
       'disable_nacl',
     ],
     'gn_release_libfuzzer_ubsan': [
-      'gn', 'release', 'libfuzzer', 'ubsan_security', 'chromeos_with_codecs',
+      'gn', 'release', 'libfuzzer', 'ubsan_security', 'chromeos_codecs',
       'pdf_xfa', 'disable_nacl',
     ],
 
     'gn_release_trybot': [
       'gn', 'release_trybot',
     ],
 
     'gn_release_trybot_x64': [
       'gn', 'release_trybot', 'x64',
     ],
@@ skipping 1119 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',
     },
   },
 }