Switch SupportsUserData uses to use unique_ptr.

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"
 
 @class CRWWKScriptMessageRouter;
 @class WKWebViewConfiguration;
 
 namespace web {
 
 class BrowserState;
 
 // A provider class associated with a single web::BrowserState object. Manages
 // the lifetime and performs setup of WKWebViewConfiguration and
 // CRWWKScriptMessageRouter instances. Not threadsafe. Must be used only on the
 // main thread.
 class WKWebViewConfigurationProvider : public base::SupportsUserData::Data {
  public:
+  ~WKWebViewConfigurationProvider() override;
+
   // Returns a provider for the given |browser_state|. Lazily attaches one if it
   // does not exist. |browser_state| can not be null.
   static web::WKWebViewConfigurationProvider& FromBrowserState(
       web::BrowserState* browser_state);
 
   // Returns an autoreleased copy of WKWebViewConfiguration associated with
   // browser state. Lazily creates the config. Configuration's |preferences|
   // will have scriptCanOpenWindowsAutomatically property set to YES.
   // Must be used instead of [[WKWebViewConfiguration alloc] init].
   // Callers must not retain the returned object.
   WKWebViewConfiguration* GetWebViewConfiguration();
 
   // Returns CRWWKScriptMessafeRouter associated with WKWebViewConfiguration.
   // Lazily creates the router. Callers must not retain the returned object
   // (this will be enforced in debug builds).
   CRWWKScriptMessageRouter* GetScriptMessageRouter();
 
   // 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;
-  ~WKWebViewConfigurationProvider() override;
 
   base::scoped_nsobject<WKWebViewConfiguration> configuration_;
   base::scoped_nsobject<CRWWKScriptMessageRouter> router_;
   BrowserState* browser_state_;
 
   DISALLOW_COPY_AND_ASSIGN(WKWebViewConfigurationProvider);
 };
 
 }  // namespace web
 
 #endif  // IOS_WEB_WEB_STATE_UI_WK_WEB_VIEW_CONFIGURATION_PROVIDER_H_