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

ios/web/webui/crw_web_ui_manager.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_WEB_WEBUI_CRW_WEB_UI_MANAGER_H_
 #define IOS_WEB_WEBUI_CRW_WEB_UI_MANAGER_H_
 
 #import <Foundation/Foundation.h>
 
+#include <memory>
+
 #import "ios/web/public/web_state/web_state_observer_bridge.h"
 #import "ios/web/webui/url_fetcher_block_adapter.h"
 
 class GURL;
 
 namespace web {
 class WebStateImpl;
 }  // namespace web
 
 // Class for managing WebUI pages. Manages fetching of resources and post-load
 // operations such as favicon loading. Initialized instances of CRWWebUIManager
 // will automatically register as an observer of webState, and should be kept in
 // scope for the lifetime of the WebUI page.
 @interface CRWWebUIManager : NSObject<CRWWebStateObserver>
 
 // Designated initializer.
 - (instancetype)initWithWebState:(web::WebStateImpl*)webState;
 
 @end
 
 @interface CRWWebUIManager (UsedOnlyForTesting)  // Testing API.
 
 // Returns URLFetcherBlockAdapter for fetching resource for URL. Can be
 // overwritten by test classes to mock resource retrieval.
-- (scoped_ptr<web::URLFetcherBlockAdapter>)
-        fetcherForURL:(const GURL&)URL
-    completionHandler:(web::URLFetcherBlockAdapterCompletion)handler;
+- (std::unique_ptr<web::URLFetcherBlockAdapter>)
+    fetcherForURL:(const GURL&)URL
+completionHandler:(web::URLFetcherBlockAdapterCompletion)handler;
 
 @end
 
 #endif  // IOS_WEB_WEBUI_CRW_WEB_UI_MANAGER_H_