Prevent usage of web payments API over insecure HTTPS.

chrome/browser/payments/ssl_validity_checker.h

+// Copyright 2017 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 CHROME_BROWSER_PAYMENTS_SSL_VALIDITY_CHECKER_H_
+#define CHROME_BROWSER_PAYMENTS_SSL_VALIDITY_CHECKER_H_
+
+#include "base/macros.h"
+
+namespace content {
+class WebContents;
+}
+
+namespace payments {
+
+class SslValidityChecker {
+ public:
+  // Returns true for |web_contents| with a valid SSL certificate. Only
+  // EV_SECURE, SECURE, and SECURE_WITH_POLICY_INSTALLED_CERT are considered
+  // valid for web payments.
+  static bool IsSslCertificateValid(content::WebContents* web_contents);
+
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(SslValidityChecker);
+};
+
+}  // namespace payments
+
+#endif  // CHROME_BROWSER_PAYMENTS_SSL_VALIDITY_CHECKER_H_