Get rid of the use_glib gn variable.

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.
 
 # 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 14 matching lines @@
 
   # Indicates if Aura is enabled. Aura is a low-level windowing library, sort
   # of a replacement for GDI or GTK.
   use_aura = is_linux
 
   # True means the UI is built using the "views" framework.
   toolkit_views = is_mac || is_chromeos || use_aura
 
   # Whether the entire browser uses toolkit-views on Mac instead of Cocoa.
   mac_views_browser = false
-
-  # Whether we should use glib, a low level C utility library.
-  use_glib = is_linux && !use_ozone
 }
 
 # Additional dependent variables -----------------------------------------------
 #
 # These variables depend on other variables and can't be set externally.
 
-if (is_linux && use_glib) {
-  use_cairo = true
-  use_pango = true
-} else {
-  use_cairo = false
-  use_pango = false
-}
+# TODO(vtl): Probably should get rid of these variables.
+use_cairo = false
+use_pango = false
 
 # 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_linux
 
 # Indicates if the UI toolkit depends on X11.
 use_x11 = is_linux && !use_ozone
 
 use_ozone_evdev = use_ozone
 
 use_clipboard_aurax11 = is_linux && use_aura && use_x11
 
 enable_hidpi = is_mac || is_chromeos || is_linux
 
 enable_topchrome_md = false