Remove use_ibus variable from gyp file.

build/linux/system.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.
 
 {
   'variables': {
     'conditions': [
       ['sysroot!=""', {
         'pkg-config': './pkg-config-wrapper "<(sysroot)" "<(target_arch)"',
       }, {
@@ skipping 783 matching lines @@
     {
       'target_name': 'libresolv',
       'type': 'none',
       'link_settings': {
         'libraries': [
           '-lresolv',
         ],
       },
     },
     {
-      'target_name': 'ibus',
-      'type': 'none',
-      'conditions': [
-        ['use_ibus==1', {
-          'variables': {
-            'ibus_min_version': '1.3.99.20110425',
-          },
-          'direct_dependent_settings': {
-            'defines': ['HAVE_IBUS=1'],
-            'cflags': [
-              '<!@(<(pkg-config) --cflags "ibus-1.0 >= <(ibus_min_version)")',
-            ],
-          },
-          'link_settings': {
-            'ldflags': [
-              '<!@(<(pkg-config) --libs-only-L --libs-only-other "ibus-1.0 >= <(ibus_min_version)")',
-            ],
-            'libraries': [
-              '<!@(<(pkg-config) --libs-only-l "ibus-1.0 >= <(ibus_min_version)")',
-            ],
-          },
-        }],
-      ],
-    },
-    {
       'target_name': 'udev',
       'type': 'none',
       'conditions': [
         # libudev is not available on *BSD
         ['_toolset=="target" and os_bsd!=1', {
           'direct_dependent_settings': {
             'cflags': [
               '<!@(<(pkg-config) --cflags libudev)'
             ],
           },
           'link_settings': {
             'ldflags': [
               '<!@(<(pkg-config) --libs-only-L --libs-only-other libudev)',
             ],
             'libraries': [
               '<!@(<(pkg-config) --libs-only-l libudev)',
             ],
           },
         }],
       ],
     },
   ],
 }