Remove use_ibus variable from gyp file.

chrome/chrome_browser.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',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 2540 matching lines @@
             ['exclude', 'browser/policy/user_policy_signin_service_factory.h'],
             ['exclude', 'browser/speech/extension_api/tts_extension_api_linux.cc'],
             ['exclude', 'browser/system_monitor/removable_device_notifications_linux.cc'],
             ['exclude', 'browser/system_monitor/removable_device_notifications_linux.h'],
             ['exclude', 'browser/ui/webui/help/version_updater_basic.cc'],
             ['exclude', 'browser/ui/webui/help/version_updater_basic.h'],
             ['exclude', 'browser/upgrade_detector_impl.cc'],
             ['exclude', 'browser/upgrade_detector_impl.h'],
           ],
         }],
-        ['use_ibus==1', {
-          'dependencies': [
-            '../build/linux/system.gyp:ibus',
-          ],
-        }],
         ['use_cups==1', {
           'dependencies': [
             '../printing/printing.gyp:cups',
           ],
         }],
         ['use_gnome_keyring==0', {
           'sources!': [
             'browser/password_manager/native_backend_gnome_x.cc',
             'browser/password_manager/native_backend_gnome_x.h',
           ],
@@ skipping 555 matching lines @@
           'variables': {
             'jni_gen_dir': 'chrome',
           },
           'includes': [ '../build/jni_generator.gypi' ],
         },
       ],
      },
     ],
   ],
 }