Refactor SecurityStateModel/Clients for simplicity and reusability.

components/security_state/content/web_contents_security_state_model.h

Index: components/security_state/content/web_contents_security_state_model.h
diff --git a/components/security_state/content/web_contents_security_state_model.h b/components/security_state/content/web_contents_security_state_model.h
new file mode 100644
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+++ b/components/security_state/content/web_contents_security_state_model.h
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+// 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.
+
+#ifndef COMPONENTS_SECURITY_STATE_CONTENT_WEB_CONTENTS_SECURITY_STATE_MODEL_H_
+#define COMPONENTS_SECURITY_STATE_CONTENT_WEB_CONTENTS_SECURITY_STATE_MODEL_H_
+
+#include <memory>
+
+#include "base/macros.h"
+#include "components/security_state/core/security_state_model.h"
+#include "third_party/WebKit/public/platform/WebSecurityStyle.h"
+
+namespace content {
+class NavigationEntry;
+struct SecurityStyleExplanations;
+class WebContents;
+}
+
+namespace security_state {
+
+// Uses a WebContents to provide a SecurityStateModel with the information that
+// it needs to determine the page's security status.
+class WebContentsSecurityStateModel {
+ public:
+  explicit WebContentsSecurityStateModel(
+      content::WebContents* web_contents);
+  virtual ~WebContentsSecurityStateModel();
+
+  // Populates |result| to describe the current page.
+  // |used_policy_installed_certificate| indicates whether the page or request
+  // is known to be loaded with a certificate installed by the system admin.
+  // |failed_malware_check| indicates whether the security state should be
+  // downgraded to reflect a Safe Browsing verdict.
+  void GetSecurityInfo(SecurityStateModel::SecurityInfo* result,
+                       bool used_policy_installed_certificate,
+                       bool failed_malware_check) const;
+
+  // Retrieves the visible security state that is relevant to the
+  // SecurityStateModel.
+  std::unique_ptr<SecurityStateModel::VisibleSecurityState>
+  GetVisibleSecurityState(bool failed_malware_check) const;
+
+  // Returns the SecurityStyle that should be applied to a WebContents
+  // with the given |security_info|. Populates
+  // |security_style_explanations| to explain why the returned
+  // SecurityStyle was chosen.
+  static blink::WebSecurityStyle GetSecurityStyle(
+      const SecurityStateModel::SecurityInfo& security_info,
+      content::SecurityStyleExplanations* security_style_explanations);
+
+ private:
+  content::WebContents* web_contents_;
+  std::unique_ptr<SecurityStateModel> security_state_model_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebContentsSecurityStateModel);
+};
+
+}  // namespace security_state
+
+#endif  // COMPONENTS_SECURITY_STATE_CONTENT_WEB_CONTENTS_SECURITY_STATE_MODEL_H_