Linux: remove unmaintained SELinux code.

content/content_shell.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.
 
 {
   'variables': {
     'content_shell_product_name': 'Content Shell',
     # The "19" is so that sites that sniff for version think that this is
     # something reasonably current; the "77.34.5" is a hint that this isn't a
     # standard Chrome.
@@ skipping 357 matching lines @@
           'configurations': {
             'Debug_Base': {
               'msvs_settings': {
                 'VCLinkerTool': {
                   'LinkIncremental': '<(msvs_large_module_debug_link_mode)',
                 },
               },
             },
           },
         }],  # OS=="win"
-        ['OS == "win" or (toolkit_uses_gtk == 1 and selinux == 0)', {
+        ['OS == "win" or toolkit_uses_gtk == 1', {
           'dependencies': [
             '../sandbox/sandbox.gyp:sandbox',
           ],
-        }],  # OS=="win" or (toolkit_uses_gtk == 1 and selinux == 0)
+        }],  # OS=="win" or toolkit_uses_gtk == 1
         ['toolkit_uses_gtk == 1', {
           'dependencies': [
             '<(DEPTH)/build/linux/system.gyp:gtk',
           ],
         }],  # toolkit_uses_gtk
         ['OS=="mac"', {
           'product_name': '<(content_shell_product_name)',
           'dependencies!': [
             'content_shell_lib',
           ],
@@ skipping 294 matching lines @@
             'native_lib_target': 'libcontent_shell_content_view',
             'additional_input_paths': ['<(PRODUCT_DIR)/content_shell/assets/content_shell.pak'],
             'asset_location': '<(ant_build_out)/content_shell/assets',
           },
           'includes': [ '../build/java_apk.gypi' ],
         },
       ],
     }],  # OS=="android"
   ]
 }