Hide X11 dependencies when use_x11=0.

chrome/chrome_browser_ui.gypi

 # Copyright 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.
 
 {
   'targets': [
     {
       'target_name': 'browser_ui',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 3308 matching lines @@
               ]
             }],
           ],
         }],
         ['OS=="linux"', {
           'conditions': [
             ['use_aura==1', {
               'dependencies': [
                 '../build/linux/system.gyp:dbus',
                 '../build/linux/system.gyp:fontconfig',
-                '../build/linux/system.gyp:x11',
                 '../dbus/dbus.gyp:dbus',
               ],
             }],
             # GTK build only
             ['toolkit_uses_gtk==1', {
               'sources/': [
                 ['exclude', '^browser/ui/toolbar/bookmark_sub_menu_model.cc'],
                 ['exclude', '^browser/ui/views/notifications/balloon_collection_views.cc'],
               ],
             }],
+            # x11 build
+            ['use_x11==1', {
+              'dependencies': [
+                '../build/linux/system.gyp:x11',
+              ],
+            }],
           ],
         }],
         # On chromeos, file manager extension handles the file open/save dialog.
         ['chromeos==1', {
           'sources/': [
             ['include', '^browser/ui/views/select_file_dialog_extension.cc'],
             ['include', '^browser/ui/views/select_file_dialog_extension.h'],
             ['include', '^browser/ui/views/select_file_dialog_extension_factory.cc'],
             ['include', '^browser/ui/views/select_file_dialog_extension_factory.h'],
           ]}, {
@@ skipping 62 matching lines @@
             'browser/ui/webui/local_discovery/local_discovery_ui.cc',
             'browser/ui/webui/local_discovery/local_discovery_ui.h',
             'browser/ui/webui/local_discovery/local_discovery_ui_handler.cc',
             'browser/ui/webui/local_discovery/local_discovery_ui_handler.h',
           ],
         }],
       ],
     },
   ],
 }