Refactor SecurityStateModel/Clients for simplicity and reusability.

components/security_state/ios/ios_security_state_model.h

+// 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.
+
+#ifndef COMPONENTS_SECURITY_STATE_IOS_IOS_SECURITY_STATE_MODEL_H_
+#define COMPONENTS_SECURITY_STATE_IOS_IOS_SECURITY_STATE_MODEL_H_
+
+#include <memory>
+
+#include "base/macros.h"
+#include "components/security_state/core/security_state_model.h"
+#include "ios/web/public/web_state/web_state_user_data.h"
+
+namespace web {
+class WebState;
+}  // namespace web
+
+namespace security_state {
+
+// Uses a WebState to provide a SecurityStateModel with the
+// information that it needs to determine the page's security status.
+class IOSSecurityStateModel
+    : public web::WebStateUserData<IOSSecurityStateModel> {
+ public:
+  ~IOSSecurityStateModel() override;
+
+  void GetSecurityInfo(
+      security_state::SecurityStateModel::SecurityInfo* result) const;
+
+ private:
+  explicit IOSSecurityStateModel(web::WebState* web_state);
+  friend class web::WebStateUserData<IOSSecurityStateModel>;
+
+  std::unique_ptr<security_state::SecurityStateModel::VisibleSecurityState>
+  GetVisibleSecurityState() const;
+  bool UsedPolicyInstalledCertificate() const;
+
+  web::WebState* web_state_;
+  std::unique_ptr<security_state::SecurityStateModel> security_state_model_;
+
+  DISALLOW_COPY_AND_ASSIGN(IOSSecurityStateModel);
+};
+
+}  // namespace security_state
+
+#endif  // COMPONENTS_SECURITY_STATE_IOS_IOS_SECURITY_STATE_MODEL_H_