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

ios/chrome/browser/net/ios_chrome_network_delegate.h

 // 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 IOS_CHROME_BROWSER_NET_IOS_CHROME_NETWORK_DELEGATE_H_
 #define IOS_CHROME_BROWSER_NET_IOS_CHROME_NETWORK_DELEGATE_H_
 
 #include <stdint.h>
 
+#include <memory>
+
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
 #include "components/content_settings/core/browser/cookie_settings.h"
 #include "net/base/network_delegate_impl.h"
 
 class PrefService;
 
 template <typename T>
 class PrefMember;
 
 typedef PrefMember<bool> BooleanPrefMember;
 
@@ skipping 49 matching lines @@
 
   scoped_refptr<content_settings::CookieSettings> cookie_settings_;
 
   // Weak, owned by our owner.
   BooleanPrefMember* enable_do_not_track_;
 
   DISALLOW_COPY_AND_ASSIGN(IOSChromeNetworkDelegate);
 };
 
 #endif  // IOS_CHROME_BROWSER_NET_IOS_CHROME_NETWORK_DELEGATE_H_