Remove android system expat support.

third_party/expat/expat.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': [
       # On Linux, we implicitly already depend on expat via fontconfig;
       # let's not pull it in twice.
       ['os_posix == 1 and OS != "mac" and OS != "ios" and OS != "android"', {
@@ skipping 16 matching lines @@
     ['use_system_expat == 1', {
       'targets': [
         {
           'target_name': 'expat',
           'type': 'none',
           'link_settings': {
             'libraries': [
               '-lexpat',
             ],
           },
-          'conditions': [
-            ['OS=="android"', {
-              'direct_dependent_settings': {
-                'include_dirs': [
-                  '<(android_src)/external/expat/lib',
-                ],
-              },
-            }],
-          ],
         },
       ],
     }, {  # else: use_system_expat != 1
       'targets': [
         {
           'target_name': 'expat',
           'type': 'static_library',
           'sources': [
             'files/lib/expat.h',
             'files/lib/xmlparse.c',
@@ skipping 23 matching lines @@
               'defines': [
                 'HAVE_EXPAT_CONFIG_H',
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }