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

ios/web/public/navigation_item.h

 // Copyright 2014 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_WEB_PUBLIC_NAVIGATION_ITEM_H_
 #define IOS_WEB_PUBLIC_NAVIGATION_ITEM_H_
 
-#include "base/memory/scoped_ptr.h"
+#include <memory>
+
 #include "base/strings/string16.h"
 #include "base/supports_user_data.h"
 #include "base/time/time.h"
 #include "ios/web/public/web_state/page_display_state.h"
 #include "ui/base/page_transition_types.h"
 
 class GURL;
 
 @class NSDictionary;
 
 namespace web {
 struct FaviconStatus;
 struct Referrer;
 struct SSLStatus;
 
 // A NavigationItem is a data structure that captures all the information
 // required to recreate a browsing state. It represents one point in the
 // chain of navigation managed by a NavigationManager.
 class NavigationItem : public base::SupportsUserData {
  public:
   // Creates a new NavigationItem.
-  static scoped_ptr<NavigationItem> Create();
+  static std::unique_ptr<NavigationItem> Create();
 
   // Page-related stuff --------------------------------------------------------
 
   // A unique ID is preserved across commits and redirects, which means that
   // sometimes a NavigationEntry's unique ID needs to be set (e.g. when
   // creating a committed entry to correspond to a to-be-deleted pending entry,
   // the pending entry's ID must be copied).
   virtual int GetUniqueID() const = 0;
 
   // The actual URL of the page. For some about pages, this may be a scary
@@ skipping 78 matching lines @@
   virtual NSDictionary* GetHttpRequestHeaders() const = 0;
 
   // Adds headers from |additional_headers| to the item's http request headers.
   // Existing headers with the same key will be overridden.
   virtual void AddHttpRequestHeaders(NSDictionary* additional_headers) = 0;
 };
 
 }  // namespace web
 
 #endif  // IOS_WEB_PUBLIC_NAVIGATION_ITEM_H_