Remove all uses of toolkit_use_gtk in the gyp files.

jingle/jingle.gyp

 # Copyright (c) 2012 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.
 
 {
   'includes': [
     'jingle.gypi',
   ],
   'variables': {
     'chromium_code': 1,
@@ skipping 81 matching lines @@
             '../base/base.gyp:base',
             '../net/net.gyp:net',
             '../third_party/expat/expat.gyp:expat',
             '../third_party/libjingle/libjingle.gyp:libjingle',
             '../url/url.gyp:url_lib',
             'jingle_glue',
           ],
           'export_dependent_settings': [
             '../third_party/libjingle/libjingle.gyp:libjingle',
           ],
-          'conditions': [
-            ['toolkit_uses_gtk == 1', {
-              'dependencies': [
-                '../build/linux/system.gyp:gtk'
-              ],
-            }],
-          ],
         },
         {
           'target_name': 'notifier_test_util',
           'type': 'static_library',
           'sources': [
             'notifier/base/fake_base_task.cc',
             'notifier/base/fake_base_task.h',
             'notifier/listener/fake_push_client.cc',
             'notifier/listener/fake_push_client.h',
             'notifier/listener/fake_push_client_observer.cc',
@@ skipping 106 matching lines @@
           ],
         },
         {
           'target_name': 'notifier_test_util',
           'type': 'none',
         },
       ],
     }],
   ],
 }