Adds support for POST request with bodies on WKWebView.

ios/web/ios_web_unittests.gyp

 # Copyright 2013 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': {
     'chromium_code': 1,
   },
   'targets': [
     {
       # GN version: //ios/web:ios_web_unittests
@@ skipping 45 matching lines @@
         'url_util_unittest.cc',
         'weak_nsobject_counter_unittest.mm',
         'web_state/crw_pass_kit_downloader_unittest.mm',
         'web_state/crw_web_view_scroll_view_proxy_unittest.mm',
         'web_state/js/common_js_unittest.mm',
         'web_state/js/core_js_unittest.mm',
         'web_state/js/credential_util_unittest.mm',
         'web_state/js/crw_js_early_script_manager_unittest.mm',
         'web_state/js/crw_js_injection_manager_unittest.mm',
         'web_state/js/crw_js_invoke_parameter_queue_unittest.mm',
+        'web_state/js/crw_js_post_request_loader_unittest.mm',
         'web_state/js/crw_js_window_id_manager_unittest.mm',
         'web_state/js/page_script_util_unittest.mm',
         'web_state/ui/crw_static_file_web_view_unittest.mm',
         'web_state/ui/crw_ui_simple_web_view_controller_unittest.mm',
         'web_state/ui/crw_web_controller_container_view_unittest.mm',
         'web_state/ui/crw_web_controller_observer_unittest.mm',
         'web_state/ui/crw_web_controller_unittest.mm',
         'web_state/ui/crw_wk_script_message_router_unittest.mm',
         'web_state/ui/crw_wk_simple_web_view_controller_unittest.mm',
         'web_state/ui/crw_wk_web_view_crash_detector_unittest.mm',
@@ skipping 20 matching lines @@
               'test/data/testpass.pkpass',
             ],
             'test_data_prefix': 'ios/web',
           },
           'includes': [ '../../build/copy_test_data_ios.gypi' ],
         },
       ],
     },
   ],
 }