Make GConf dependency optional.

chrome/chrome_browser.gypi

 # Copyright (c) 2010 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': 'browser',
       'type': '<(library)',
       'msvs_guid': '5BF908A7-68FB-4A4B-99E3-8C749F1FE4EA',
@@ skipping 3394 matching lines @@
             'browser/password_manager/native_backend_kwallet_x.h',
             'browser/password_manager/native_backend_kwallet_x.cc',
             'browser/platform_util_linux.cc',
           ],
           'link_settings': {
             'libraries': [
               '-lpulse',
             ],
           },
         }],
+        ['use_gconf==0', {
+          'sources!': [
+            'browser/gtk/gconf_titlebar_listener.cc',
+            'browser/gtk/gconf_titlebar_listener.h',
+          ],
+        }],
         ['use_gnome_keyring==0', {
           'sources!': [
             'browser/password_manager/native_backend_gnome_x.h',
             'browser/password_manager/native_backend_gnome_x.cc',
           ],
         }],
         ['touchui==0', {
           'sources!': [
             'browser/dom_ui/keyboard_ui.cc',
             'browser/dom_ui/keyboard_ui.h',
@@ skipping 890 matching lines @@
       ],
     },
   ],
 }
 
 # Local Variables:
 # tab-width:2
 # indent-tabs-mode:nil
 # End:
 # vim: set expandtab tabstop=2 shiftwidth=2: