Remove SecurityStateModel memoization

ios/chrome/browser/ssl/ios_chrome_security_state_model_client.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 IOS_CHROME_BROWSER_SSL_IOS_CHROME_SECURITY_STATE_MODEL_CLIENT_H_
 #define IOS_CHROME_BROWSER_SSL_IOS_CHROME_SECURITY_STATE_MODEL_CLIENT_H_
 
 #include <memory>
 
 #include "base/macros.h"
 #include "components/security_state/security_state_model.h"
 #include "components/security_state/security_state_model_client.h"
 #include "ios/web/public/web_state/web_state_user_data.h"
 
 namespace web {
 class WebState;
 }  // namespace web
 
 // Uses a WebState to provide a SecurityStateModel with the
 // information that it needs to determine the page's security status.
 class IOSChromeSecurityStateModelClient
     : public security_state::SecurityStateModelClient,
       public web::WebStateUserData<IOSChromeSecurityStateModelClient> {
  public:
   ~IOSChromeSecurityStateModelClient() override;
 
-  const security_state::SecurityStateModel::SecurityInfo& GetSecurityInfo()
-      const;
+  void GetSecurityInfo(
+      security_state::SecurityStateModel::SecurityInfo* result) const;
 
   // SecurityStateModelClient:
   void GetVisibleSecurityState(
       security_state::SecurityStateModel::VisibleSecurityState* state) override;
   bool RetrieveCert(scoped_refptr<net::X509Certificate>* cert) override;
   bool UsedPolicyInstalledCertificate() override;
   bool IsOriginSecure(const GURL& url) override;
 
  private:
   explicit IOSChromeSecurityStateModelClient(web::WebState* web_state);
   friend class web::WebStateUserData<IOSChromeSecurityStateModelClient>;
 
   web::WebState* web_state_;
   std::unique_ptr<security_state::SecurityStateModel> security_state_model_;
 
   DISALLOW_COPY_AND_ASSIGN(IOSChromeSecurityStateModelClient);
 };
 
 #endif  // IOS_CHROME_BROWSER_SSL_IOS_CHROME_SECURITY_STATE_MODEL_CLIENT_H_