Remove use_ibus variable from gyp file.

chrome/chrome_browser_chromeos.gypi

 # 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.
 
 {
   'targets': [
     {
       'target_name': 'browser_chromeos',
       'type': 'static_library',
@@ skipping 709 matching lines @@
             ['exclude', 'browser/chromeos/extensions/file_handler_util.h'],
             ['exclude', 'browser/chromeos/extensions/file_handler_util.cc'],
             ['exclude', 'browser/chromeos/extensions/file_manager_util.h'],
             ['exclude', 'browser/chromeos/extensions/file_manager_util.cc'],
             ['exclude', 'browser/chromeos/extensions/media_player_api.cc'],
             ['exclude', 'browser/chromeos/extensions/media_player_api.h'],
             ['exclude', 'browser/chromeos/extensions/zip_file_creator.h'],
             ['exclude', 'browser/chromeos/extensions/zip_file_creator.cc'],
           ],
         }],
-        ['use_ibus==1', {
-          'dependencies': [
-            '../build/linux/system.gyp:ibus',
-          ],
-        }],
         ['use_ash==1', {
           'dependencies': [
             '../ash/ash.gyp:ash',
             '../ash/ash.gyp:ash_resources',
             '../ash/ash_strings.gyp:ash_strings',
             '../ui/app_list/app_list.gyp:app_list',
             '../ui/message_center/message_center.gyp:message_center',
           ],
         }],
         ['use_aura==1', {
@@ skipping 43 matching lines @@
       'type': 'static_library',
       'sources': [ 'browser/chromeos/drive/drive.proto' ],
       'variables': {
         'proto_in_dir': 'browser/chromeos/drive',
         'proto_out_dir': 'chrome/browser/chromeos/drive',
       },
       'includes': [ '../build/protoc.gypi' ]
     },
   ],
 }