Remove ibus checking script from views.gyp and add use_ibus=1 option

build/linux/system.gyp

 # Copyright (c) 2009 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.
 
 {
   'conditions': [
     ['sysroot!=""', {
       'variables': {
         'pkg-config': './pkg-config-wrapper "<(sysroot)"',
       },
@@ skipping 332 matching lines @@
       'link_settings': {
         'libraries': [
           '-lresolv',
         ],
       },
     },
     {
       'target_name': 'ibus',
       'type': 'settings',
       'conditions': [
-        ['"<!@(<(pkg-config) --atleast-version=1.3.99 ibus-1.0 || echo $?)"==""', {
-          'variables': {
-            'ibus': 1
-          },
+        ['use_ibus==1', {
           'direct_dependent_settings': {
             'cflags': [
               '<!@(<(pkg-config) --cflags ibus-1.0)',
             ],
           },
           'link_settings': {
             'ldflags': [
               '<!@(<(pkg-config) --libs-only-L --libs-only-other ibus-1.0)',
             ],
             'libraries': [
               '<!@(<(pkg-config) --libs-only-l ibus-1.0)',
             ],
           },
         }],
       ],
     },
   ],
 }
 
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