Make the gyp files more cross-platform across the Unices

ui/ui_views.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': [
     {
       'target_name': 'v2',
       'type': '<(library)',
       'msvs_guid': '70760ECA-4D8B-47A4-ACDC-D3E7F25F0543',
@@ skipping 42 matching lines @@
         'views/window/native_window.h',
         'views/window/native_window_views.cc',
         'views/window/native_window_views.h',
         'views/window/native_window_win.cc',
         'views/window/native_window_win.h',
       ],
       'include_dirs': [
         '../',
       ],
       'conditions': [
-        ['OS=="linux" or OS=="freebsd" or OS=="openbsd"', {
+        ['toolkit_uses_gtk==1', {
           'dependencies': [
             '../build/linux/system.gyp:gtk',
             '../build/linux/system.gyp:x11',
             '../build/linux/system.gyp:xext',
           ],
           'sources!': [
           ],
         }],
         ['OS=="win"', {
           'include_dirs': [
@@ skipping 25 matching lines @@
       ],
     },
   ],
 }
 
 # Local Variables:
 # tab-width:2
 # indent-tabs-mode:nil
 # End:
 # vim: set expandtab tabstop=2 shiftwidth=2: