[Mac] Modify the ObjC exception preprocessor to make some exceptions fatal.

chrome/test/BUILD.gn

 # 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.
 
 import("//build/config/chrome_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//chrome/common/features.gni")
@@ skipping 3092 matching lines @@
     "../browser/browsing_data/browsing_data_remover_test_util.h",
     "../browser/browsing_data/browsing_data_remover_unittest.cc",
     "../browser/browsing_data/browsing_data_service_worker_helper_unittest.cc",
     "../browser/browsing_data/cookies_tree_model_unittest.cc",
     "../browser/browsing_data/origin_filter_builder_unittest.cc",
     "../browser/browsing_data/registrable_domain_filter_builder_unittest.cc",
     "../browser/browsing_data/site_data_size_collector_unittest.cc",
     "../browser/budget_service/budget_database_unittest.cc",
     "../browser/budget_service/budget_manager_unittest.cc",
     "../browser/character_encoding_unittest.cc",
-    "../browser/chrome_browser_application_mac_unittest.mm",
     "../browser/chrome_content_browser_client_unittest.cc",
     "../browser/chrome_process_singleton_win_unittest.cc",
     "../browser/command_updater_unittest.cc",
     "../browser/component_updater/chrome_component_updater_configurator_unittest.cc",
     "../browser/component_updater/component_installer_errors_unittest.cc",
     "../browser/component_updater/origin_trials_component_installer_unittest.cc",
     "../browser/component_updater/sth_set_component_installer_unittest.cc",
     "../browser/component_updater/subresource_filter_component_installer_unittest.cc",
     "../browser/component_updater/supervised_user_whitelist_installer_unittest.cc",
     "../browser/component_updater/sw_reporter_installer_win_unittest.cc",
@@ skipping 55 matching lines @@
     "../browser/install_verification/win/module_info_unittest.cc",
     "../browser/install_verification/win/module_list_unittest.cc",
     "../browser/install_verification/win/module_verification_test.cc",
     "../browser/install_verification/win/module_verification_test.h",
     "../browser/installable/installable_manager_unittest.cc",
     "../browser/internal_auth_unittest.cc",
     "../browser/io_thread_unittest.cc",
     "../browser/loader/chrome_navigation_data_unittest.cc",
     "../browser/loader/chrome_resource_dispatcher_host_delegate_unittest.cc",
     "../browser/logging_chrome_unittest.cc",
+    "../browser/mac/exception_processor_unittest.mm",
     "../browser/mac/keystone_glue_unittest.mm",
     "../browser/manifest/manifest_icon_downloader_unittest.cc",
     "../browser/manifest/manifest_icon_selector_unittest.cc",
     "../browser/media/midi_permission_context_unittest.cc",
     "../browser/media/webrtc/media_stream_device_permission_context_unittest.cc",
     "../browser/metrics/antivirus_metrics_provider_win_unittest.cc",
     "../browser/metrics/chrome_browser_main_extra_parts_metrics_unittest.cc",
     "../browser/metrics/chrome_metrics_service_accessor_unittest.cc",
     "../browser/metrics/perf/perf_provider_chromeos_unittest.cc",
     "../browser/metrics/subprocess_metrics_provider_unittest.cc",
@@ skipping 1947 matching lines @@
 }
 
 if (is_win) {
   loadable_module("conflicts_dll") {
     testonly = true
     sources = [
       "conflicts/conflicts_dll.cc",
     ]
   }
 }