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

chrome/browser/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/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/split_static_library.gni")
 import("//chrome/common/features.gni")
@@ skipping 486 matching lines @@
     "loader/chrome_navigation_data.cc",
     "loader/chrome_navigation_data.h",
     "loader/chrome_resource_dispatcher_host_delegate.cc",
     "loader/chrome_resource_dispatcher_host_delegate.h",
     "loader/predictor_resource_throttle.cc",
     "loader/predictor_resource_throttle.h",
     "mac/bluetooth_utility.h",
     "mac/bluetooth_utility.mm",
     "mac/dock.h",
     "mac/dock.mm",
+    "mac/exception_processor.h",
+    "mac/exception_processor.mm",
     "mac/install_from_dmg.h",
     "mac/install_from_dmg.mm",
     "mac/keystone_glue.h",
     "mac/keystone_glue.mm",
     "mac/keystone_registration.h",
     "mac/keystone_registration.mm",
     "mac/mac_startup_profiler.cc",
     "mac/mac_startup_profiler.h",
     "mac/master_prefs.h",
     "mac/master_prefs.mm",
@@ skipping 3934 matching lines @@
   # linking all of the test support.
   static_library("pepper_cdm_test_constants") {
     testonly = true
     visibility = [ "//chrome/*" ]
     sources = [
       "media/pepper_cdm_test_constants.cc",
       "media/pepper_cdm_test_constants.h",
     ]
   }
 }