Patch 2: Added a preprocessor flag for platform spellcheck.

build/config/features.gni

 # 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.
 
 # This file contains Chrome-feature-related build flags (see ui.gni for
 # UI-related ones). These should theoretically be moved to the build files of
 # the features themselves.
 #
 # However, today we have many "bad" dependencies on some of these flags from,
 # e.g. base, so they need to be global to match the GYP configuration. Also,
@@ skipping 107 matching lines @@
 } else {
   cld_version = 2
 }
 
 # libudev usage. This currently only affects the content layer.
 use_udev = is_linux
 
 # Enable the spell checker.
 enable_spellcheck = !is_android
 
+# Use the operating system's spellchecker rather than hunspell.
+use_platform_spellchecker = is_android || is_mac
+
 enable_pepper_cdms = enable_plugins && (is_linux || is_mac || is_win)
 
 # Enable basic printing support and UI.
 enable_basic_printing = !is_chromeos
 
 # Enable printing with print preview. It does not imply
 # enable_basic_printing. It's possible to build Chrome with preview only.
 enable_print_preview = !is_android
 
 # The seccomp-bpf sandbox is only supported on three architectures
@@ skipping 53 matching lines @@
 # Hangout services is an extension that adds extra features to Hangouts.
 # For official GYP builds, this flag is set, it will likely need to be
 # parameterized in the future for a similar use.
 enable_hangout_services_extension = false
 
 # Whether to back up data before sync.
 enable_pre_sync_backup = is_win || is_mac || (is_linux && !is_chromeos)
 
 # WebVR support disabled until platform implementations have been added
 enable_webvr = false