Move SecurityInterstitialPage into component

components/security_interstitials/content/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.
 
-static_library("unsafe_resource") {
+static_library("security_interstitial_page") {
   sources = [
+    "security_interstitial_controller_client.cc",
+    "security_interstitial_controller_client.h",
+    "security_interstitial_page.cc",
+    "security_interstitial_page.h",
     "unsafe_resource.cc",
     "unsafe_resource.h",
   ]
 
   public_deps = [
     "//components/safe_browsing_db:hit_report",
   ]
 
   deps = [
     "//base",
+    "//components/prefs:prefs",
+    "//components/resources",
+    "//components/safe_browsing_db:hit_report",
+    "//components/safe_browsing_db:safe_browsing_prefs",
     "//components/safe_browsing_db:util",
+    "//components/security_interstitials/core:core",
     "//content/public/browser",
+    "//content/public/common",
   ]
 }