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

ios/chrome/browser/favicon/large_icon_cache.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_FAVICON_LARGE_ICON_CACHE_H_
 #define IOS_CHROME_BROWSER_FAVICON_LARGE_ICON_CACHE_H_
 
+#include <memory>
+
 #include "base/containers/mru_cache.h"
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "components/keyed_service/core/keyed_service.h"
 
 class GURL;
 struct LargeIconCacheEntry;
 
 namespace favicon_base {
 struct LargeIconResult;
 }
 
 namespace ios {
 class ChromeBrowserState;
 }
 
 // Provides a cache of most recently used LargeIconResult.
 //
 // Example usage:
 //   LargeIconCache* large_icon_cache =
 //       IOSChromeLargeIconServiceFactory::GetForBrowserState(browser_state);
-//   scoped_ptr<favicon_base::LargeIconResult> icon =
+//   std::unique_ptr<favicon_base::LargeIconResult> icon =
 //       large_icon_cache->GetCachedResult(...);
 //
 class LargeIconCache : public KeyedService {
  public:
   LargeIconCache();
   ~LargeIconCache() override;
 
   // |LargeIconService| does everything on callbacks, and iOS needs to load the
   // icons immediately on page load. This caches the LargeIconResult so we can
   // immediately load.
   void SetCachedResult(const GURL& url, const favicon_base::LargeIconResult&);
 
   // Returns a cached LargeIconResult.
-  scoped_ptr<favicon_base::LargeIconResult> GetCachedResult(const GURL& url);
+  std::unique_ptr<favicon_base::LargeIconResult> GetCachedResult(
+      const GURL& url);
 
  private:
   // Clones a LargeIconResult.
-  scoped_ptr<favicon_base::LargeIconResult> CloneLargeIconResult(
+  std::unique_ptr<favicon_base::LargeIconResult> CloneLargeIconResult(
       const favicon_base::LargeIconResult& large_icon_result);
 
-  base::MRUCache<GURL, scoped_ptr<LargeIconCacheEntry>> cache_;
+  base::MRUCache<GURL, std::unique_ptr<LargeIconCacheEntry>> cache_;
 
   DISALLOW_COPY_AND_ASSIGN(LargeIconCache);
 };
 
 #endif  // IOS_CHROME_BROWSER_FAVICON_LARGE_ICON_CACHE_H_