Remove some global UI defines

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
@@ skipping 36 matching lines @@
   use_xkbcommon = false
 
   # Whether we should use glib, a low level C utility library.
   use_glib = is_linux
 
   # Indicates if Wayland display server support is enabled.
   enable_wayland_server = is_chromeos
 
   # Enable experimental vulkan backend.
   enable_vulkan = false
-
-  # Allow aura to access x11 clipboard.
-  enable_clipboard_aurax11 = false
 }
 
 # Additional dependent variables -----------------------------------------------
 #
 # These variables depend on other variables and can't be set externally.
 
 # Use GPU accelerated cross process image transport by default on linux builds
 # with the Aura window manager.
 ui_compositor_image_transport = use_aura && is_linux
 
-use_default_render_theme = use_aura && !is_android
-
 # Indicates if the UI toolkit depends on X11.
 use_x11 = is_linux && !use_ozone
 
 # Turn off glib if Ozone is enabled.
 if (use_ozone) {
   use_glib = false
 }
 
 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_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.