Convert //ios from scoped_ptr to std::unique_ptr.

ios/chrome/browser/ssl/ios_ssl_blocking_page.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_SSL_BLOCKING_PAGE_H_
 #define IOS_CHROME_BROWSER_SSL_IOS_SSL_BLOCKING_PAGE_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 53 matching lines @@
   static bool IsOverridable(int options_mask);
 
   base::Callback<void(bool)> callback_;
   const net::SSLInfo ssl_info_;
   const bool overridable_;  // The UI allows the user to override the error.
 
   // The user previously allowed a bad certificate, but the decision has now
   // expired.
   const bool expired_but_previously_allowed_;
 
-  scoped_ptr<IOSChromeControllerClient> controller_;
-  scoped_ptr<security_interstitials::SSLErrorUI> ssl_error_ui_;
+  std::unique_ptr<IOSChromeControllerClient> controller_;
+  std::unique_ptr<security_interstitials::SSLErrorUI> ssl_error_ui_;
 
   DISALLOW_COPY_AND_ASSIGN(IOSSSLBlockingPage);
 };
 
 #endif  // IOS_CHROME_BROWSER_SSL_IOS_SSL_BLOCKING_PAGE_H_