[ObjC ARC] Converts ios/web:web to ARC.

ios/web/web_state/ui/wk_web_view_configuration_provider.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_WEB_STATE_UI_WK_WEB_VIEW_CONFIGURATION_PROVIDER_H_
 #define IOS_WEB_WEB_STATE_UI_WK_WEB_VIEW_CONFIGURATION_PROVIDER_H_
 
 #import "base/mac/scoped_nsobject.h"
 #include "base/macros.h"
 #include "base/supports_user_data.h"
@@ skipping 32 matching lines @@
 
   // Purges config and router objects if they exist. When this method is called
   // config and config's process pool must not be retained by anyone (this will
   // be enforced in debug builds).
   void Purge();
 
  private:
   explicit WKWebViewConfigurationProvider(BrowserState* browser_state);
   WKWebViewConfigurationProvider() = delete;
 
-  base::scoped_nsobject<WKWebViewConfiguration> configuration_;
-  base::scoped_nsobject<CRWWKScriptMessageRouter> router_;
+  WKWebViewConfiguration* configuration_;
+  CRWWKScriptMessageRouter* router_;
   BrowserState* browser_state_;
 
   DISALLOW_COPY_AND_ASSIGN(WKWebViewConfigurationProvider);
 };
 
 }  // namespace web
 
 #endif  // IOS_WEB_WEB_STATE_UI_WK_WEB_VIEW_CONFIGURATION_PROVIDER_H_