Stop using CertStore which is not compatible with PlzNavigate.

ios/web/BUILD.gn

 # Copyright 2015 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.
 
 import("//ios/build/config.gni")
 import("//ios/web/js_compile.gni")
 import("//testing/test.gni")
 import("//tools/grit/grit_rule.gni")
 
 source_set("web_arc") {
@@ skipping 47 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 51 matching lines @@
     ":web_arc",
   ]
 
   sources = [
     "payments/payment_request.cc",
     "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 456 matching lines @@
 }
 
 grit("resources") {
   source = "ios_web_resources.grd"
   use_qualified_include = true
   outputs = [
     "grit/ios_web_resources.h",
     "ios_web_resources.pak",
   ]
 }