Componentize SafeBrowsingBlockingPage for WebView use

components/safe_browsing/BUILD.gn

 # Copyright 2016 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.
 
 source_set("safe_browsing") {
   sources = [
+    "base_safe_browsing_blocking_page.cc",
+    "base_safe_browsing_blocking_page.h",
     "base_ui_manager.cc",
     "base_ui_manager.h",
   ]
 
   deps = [
     "//base:base",
+    "//base:i18n",
+    "//components/safe_browsing_db:metadata_proto",
+    "//components/safe_browsing_db:safe_browsing_prefs",
     "//components/security_interstitials/content:security_interstitial_page",
+    "//components/security_interstitials/core:core",
     "//content/public/browser:browser",
   ]
 }