Add quiet safe browsing interstitial for WebView

components/security_interstitials/core/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.
 
 static_library("core") {
   sources = [
     "bad_clock_ui.cc",
     "bad_clock_ui.h",
     "base_safe_browsing_error_ui.cc",
     "base_safe_browsing_error_ui.h",
     "common_string_util.cc",
     "common_string_util.h",
     "controller_client.cc",
     "controller_client.h",
     "metrics_helper.cc",
     "metrics_helper.h",
     "safe_browsing_loud_error_ui.cc",
     "safe_browsing_loud_error_ui.h",
+    "safe_browsing_quiet_error_ui.cc",
+    "safe_browsing_quiet_error_ui.h",
     "ssl_error_ui.cc",
     "ssl_error_ui.h",
   ]
 
   deps = [
     "//base",
     "//base:i18n",
     "//components/google/core/browser",
     "//components/history/core/browser",
     "//components/metrics",
     "//components/prefs",
     "//components/ssl_errors",
     "//components/strings",
     "//components/url_formatter",
     "//net",
     "//ui/base",
   ]
 }