Stop using CertStore which is not compatible with PlzNavigate.

ios/web/ios_web.gyp

 # Copyright 2014 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': [
     {
@@ skipping 81 matching lines @@
         'navigation/navigation_manager_facade_delegate.h',
         'navigation/navigation_manager_impl.h',
         'navigation/navigation_manager_impl.mm',
         'navigation/nscoder_util.h',
         'navigation/nscoder_util.mm',
         'navigation/time_smoother.cc',
         'navigation/time_smoother.h',
         'net/cert_host_pair.cc',
         'net/cert_host_pair.h',
         'net/cert_policy.cc',
-        'net/cert_store_impl.cc',
-        'net/cert_store_impl.h',
         'net/certificate_policy_cache.cc',
         'net/clients/crw_js_injection_network_client.h',
         'net/clients/crw_js_injection_network_client.mm',
         'net/clients/crw_js_injection_network_client_factory.h',
         'net/clients/crw_js_injection_network_client_factory.mm',
         'net/clients/crw_redirect_network_client.h',
         'net/clients/crw_redirect_network_client.mm',
         'net/clients/crw_redirect_network_client_factory.h',
         'net/clients/crw_redirect_network_client_factory.mm',
         'net/cookie_notification_bridge.h',
@@ skipping 10 matching lines @@
         'net/request_tracker_factory_impl.mm',
         'net/request_tracker_impl.h',
         'net/request_tracker_impl.mm',
         'net/web_http_protocol_handler_delegate.h',
         'net/web_http_protocol_handler_delegate.mm',
         'public/active_state_manager.h',
         'public/block_types.h',
         'public/browser_state.h',
         'public/browser_url_rewriter.h',
         'public/cert_policy.h',
-        'public/cert_store.h',
         'public/certificate_policy_cache.h',
         'public/favicon_status.cc',
         'public/favicon_status.h',
         'public/favicon_url.cc',
         'public/favicon_url.h',
         'public/interstitials/web_interstitial.h',
         'public/interstitials/web_interstitial_delegate.h',
         'public/java_script_dialog_callback.h',
         'public/java_script_dialog_presenter.h',
         'public/java_script_dialog_type.h',
@@ skipping 423 matching lines @@
       'dependencies': [
         '../../base/base.gyp:base'
       ],
       'sources': [
         'public/user_agent.h',
         'public/user_agent.mm',
       ],
     },
   ],
 }