Pull SecurityStateModel out into a component

components/security_state/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.
 
-source_set("certificate_transparency") {
+# GYP version: components/security_state.gyp
+source_set("security_state") {
   sources = [
-    "log_proof_fetcher.cc",
-    "log_proof_fetcher.h",
+    "security_state_model.cc",
+    "security_state_model.h",
+    "security_state_model_client.h",
+    "switches.cc",
+    "switches.h",
   ]
 
   deps = [
     "//base",
-    "//components/safe_json",
     "//net",
-    "//url",
   ]
 }
 
 source_set("unit_tests") {
   testonly = true
   sources = [
-    "log_proof_fetcher_unittest.cc",
+    "security_state_model_unittest.cc",
   ]
 
   deps = [
-    ":certificate_transparency",
-    "//base/test:test_support",
-    "//components/safe_json:test_support",
+    ":security_state",
     "//net:test_support",
     "//testing/gtest",
   ]
 }