gn: Stop making |use_atk| depend on |use_gconf|.

build/config/ui.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.
 
 # =============================================
 #   PLEASE DO NOT ADD MORE FLAGS TO THIS FILE
 # =============================================
 #
 # These flags are effectively global. Your feature flag should go near the
 # code it controls. Most of these items are here now because they control
 # legacy global #defines passed to the compiler (now replaced with generated
 # buildflag headers -- see //build/buildflag_header.gni).
 #
 # These flags are ui-related so should eventually be moved to various places
 # in //ui/*.
 #
 # There is more advice on where to put build flags in the "Build flag" section
 # of //build/config/BUILDCONFIG.gn.
 
 import("//build/config/chromecast_build.gni")
-import("//build/config/features.gni")
 
 declare_args() {
   # Indicates if Ash is enabled. Ash is the Aura Shell which provides a
   # desktop-like environment for Aura. Requires use_aura = true
   use_ash = is_chromeos && !is_chromecast
 
   # Indicates if Ozone is enabled. Ozone is a low-level library layer for Linux
   # that does not require X11. Enabling this feature disables use of glib, x11,
   # Pango, and Cairo. Default to false on non-Chromecast builds.
   use_ozone = is_chromecast && !is_android
@@ skipping 48 matching lines @@
 
 if (is_linux && !use_ozone) {
   use_cairo = true
   use_pango = true
 } else {
   use_cairo = false
   use_pango = false
 }
 
 # Whether to use atk, the Accessibility ToolKit library
-use_atk = is_desktop_linux && use_x11 && use_gconf
+use_atk = is_desktop_linux && use_x11
 
 use_clipboard_aurax11 =
     (is_desktop_linux && use_aura && use_x11) || enable_clipboard_aurax11
 # =============================================
 #   PLEASE DO NOT ADD MORE FLAGS TO THIS FILE
 # =============================================
 #
 # See comment at the top.