Add ui/display, message_center, webview to GN build.

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 UI-related build flags. It should theoretically be in the
 # src/ui directory and only things that depend on the ui module should get the
 # definitions.
 #
 # However, today we have many "bad" dependencies on some of these flags from,
 # e.g. base, so they need to be global.
@@ skipping 52 matching lines @@
 
 # The seccomp-bpf sandbox is only supported on three architectures
 # currently.
 # Do not disable seccomp_bpf anywhere without talking to
 # security@chromium.org!
 use_seccomp_bpf = (is_linux || is_android) &&
   (cpu_arch == "x86" || cpu_arch == "x64" || cpu_arch == "arm")
 
 enable_webrtc = !is_ios
 
-# Enable notifications everywhere except Android.
+# Enable notifications everywhere except Android/iOS.
 # Android is http://crbug.com/115320
-enable_notifications = !is_android
+enable_notifications = !is_android && !is_ios
 
 # TODO(brettw) this should be moved to net and only dependents get this define.
 disable_ftp_support = is_ios
 
 enable_web_speech = (!is_android && !is_ios)
 
 use_dbus = is_linux
 
 enable_extensions = (!is_android && !is_ios)
 
@@ skipping 66 matching lines @@
 enable_google_now = !is_ios && !is_android
 
 enable_one_click_signin = is_win || is_mac || (is_linux && !is_chromeos)
 
 # Chrome OS: whether to also build the upcoming version of
 # ChromeVox, which can then be enabled via a command-line switch.
 enable_chromevox_next = false
 
 # Use brlapi from brltty for braille display support.
 use_brlapi = is_chromeos