Make the gyp files more cross-platform across the Unices

ui/ui_gfx.gypi

 # Copyright (c) 2011 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.
 
 {
   'targets': [
     {
       # TODO(rsesek): Remove this target once ui_unittests is run on the
       # waterfall instead of gfx_unittests.
       'target_name': 'gfx_unittests',
@@ skipping 115 matching lines @@
             'gfx/native_theme_win.cc',
             'gfx/native_theme_win.h',
             'gfx/win_util.cc',
             'gfx/win_util.h',
           ],
           'include_dirs': [
             '../',
             '../third_party/wtl/include',
           ],
         }],
-        ['OS=="linux" or OS=="freebsd" or OS=="openbsd"', {
+        ['toolkit_uses_gtk==1', {
           'dependencies': [
             # font_gtk.cc uses fontconfig.
             # TODO(evanm): I think this is wrong; it should just use GTK.
             '../build/linux/system.gyp:fontconfig',
             '../build/linux/system.gyp:gtk',
           ],
           'sources': [
             'gfx/gtk_native_view_id_manager.cc',
             'gfx/gtk_native_view_id_manager.h',
             'gfx/gtk_preserve_window.cc',
@@ skipping 33 matching lines @@
     },
 
   ],
 }
 
 # Local Variables:
 # tab-width:2
 # indent-tabs-mode:nil
 # End:
 # vim: set expandtab tabstop=2 shiftwidth=2: