Refactor SecurityStateModel/Clients for simplicity and reusability.

ios/chrome/browser/ssl/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("ssl") {
   sources = [
-    "ios_chrome_security_state_model_client.h",
-    "ios_chrome_security_state_model_client.mm",
+    "ios_security_state_tab_helper.h",
+    "ios_security_state_tab_helper.mm",
     "ios_ssl_blocking_page.h",
     "ios_ssl_blocking_page.mm",
     "ios_ssl_error_handler.h",
     "ios_ssl_error_handler.mm",
   ]
   deps = [
     "//base",
     "//components/security_interstitials/core",
-    "//components/security_state",
+    "//components/security_state/core",
     "//components/strings",
     "//ios/chrome/app/strings",
     "//ios/chrome/browser/browser_state",
     "//ios/chrome/browser/interstitials",
     "//ios/public/provider/chrome/browser",
     "//ios/web",
     "//net",
     "//ui/base",
     "//url",
   ]
 }
 
 source_set("unit_tests") {
   testonly = true
   sources = [
     "ios_ssl_error_handler_unittest.mm",
   ]
   deps = [
     ":ssl",
     "//ios/chrome/browser/browser_state:test_support",
     "//ios/web",
     "//ios/web:test_support",
     "//net",
     "//net:test_support",
   ]
 }