Make UBSan warnings fatal and fix the existing ones

tools_webrtc/mb/mb_config.pyl

 # Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 # FOR DETAILS ON THIS FILE SEE THE MAIN COPY IN //tools/mb/mb_config.pyl.
 # This is configuration for standalone WebRTC bots. It is used to keep the bot
@@ skipping 443 matching lines @@
 
     'release_bot': {
       'mixins': ['release', 'dcheck_always_on', 'goma'],
     },
 
     'tsan': {
       'gn_args': 'is_tsan=true',
     },
 
     'ubsan': {
-      'gn_args': 'is_ubsan=true',
+      'gn_args': 'is_ubsan=true is_ubsan_no_recover=true',
     },
 
     'ubsan_vptr': {
-      'gn_args': 'is_ubsan_vptr=true',
+      'gn_args': 'is_ubsan_vptr=true is_ubsan_no_recover=true',
     },
 
     'win_fastlink': {
       'gn_args': 'is_win_fastlink=true',
     },
 
     'x64': {
       'gn_args': 'target_cpu="x64"',
     },
 
     'x86': {
       'gn_args': 'target_cpu="x86"',
     },
 
     'use_default_libcxx': {
       'gn_args': 'use_custom_libcxx=false',
     }
   },
 }