Componentize SecurityStateModel

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("logging") {
+source_set("security_state") {
   sources = [
-    "log_buffer.cc",
-    "log_buffer.h",
-    "logging.cc",
-    "logging.h",
+    "security_state_model.cc",
+    "security_state_model.h",
   ]
 
   deps = [
     "//base",
   ]
 }
 
 source_set("unit_tests") {
   testonly = true
   sources = [
-    "logging_unittest.cc",
+    "security_state_model_unittest.cc",
   ]
-
   deps = [
-    "//base/test:test_support",
+    ":security_state",
     "//testing/gtest",
   ]
 }