Refactor SecurityStateModel/Clients for simplicity and reusability.

components/security_state/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("content") {
+  sources = [
+    "content_utils.cc",
+    "content_utils.h",
+  ]
+
+  public_deps = [
+    "//components/security_state/core",
+  ]
+
+  deps = [
+    "//base",
+    "//components/strings",
+    "//content/public/browser",
+    "//content/public/common",
+    "//net",
+    "//third_party/WebKit/public:blink_headers",
+    "//ui/base",
+  ]
+}
+
+source_set("unit_tests") {
+  testonly = true
+  sources = [
+    "content_utils_unittest.cc",
+  ]
+
+  deps = [
+    ":content",
+    "//base",
+    "//base/test:test_support",
+    "//components/security_state/core",
+    "//content/public/browser",
+    "//content/test:test_support",
+    "//net",
+    "//testing/gtest",
+  ]
+}