Make the gyp files more cross-platform across the Unices

content/content_browser.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': 'content_browser',
       'type': '<(library)',
       'dependencies': [
@@ skipping 343 matching lines @@
             'browser/renderer_host/p2p/socket_host_tcp_server.h',
             'browser/renderer_host/p2p/socket_host_udp.cc',
             'browser/renderer_host/p2p/socket_host_udp.h',
             'browser/renderer_host/p2p/socket_dispatcher_host.cc',
             'browser/renderer_host/p2p/socket_dispatcher_host.h',
           ],
         }],
         ['OS=="win"', {
           'msvs_guid': '639DB58D-32C2-435A-A711-65A12F62E442',
         }],
-        ['OS=="linux"', {
+        ['toolkit_uses_gtk == 1', {
           'dependencies': [
             '../build/linux/system.gyp:dbus-glib',
             # For FcLangSetAdd call in render_sandbox_host_linux.cc
             '../build/linux/system.gyp:fontconfig',
             '../build/linux/system.gyp:gtk',
             # For XShm* in backing_store_x.cc
             '../build/linux/system.gyp:x11',
           ],
         }],
         ['OS=="linux" and chromeos==1', {
           'sources/': [
             ['exclude', '^browser/geolocation/wifi_data_provider_linux.cc'],
             ['exclude', '^browser/geolocation/wifi_data_provider_linux.h'],
           ]
         }],
         ['OS=="mac"', {
           'link_settings': {
             'mac_bundle_resources': [
               'browser/gpu.sb',
               'browser/worker.sb',
             ],
           },
         }],
       ],
     },
   ],
 }