Switch SupportsUserData uses to use unique_ptr.

ios/web_view/internal/translate/web_view_translate_client.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_VIEW_INTERNAL_TRANSLATE_WEB_VIEW_TRANSLATE_CLIENT_H_
 #define IOS_WEB_VIEW_INTERNAL_TRANSLATE_WEB_VIEW_TRANSLATE_CLIENT_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 18 matching lines @@
 class WebState;
 }
 
 namespace ios_web_view {
 
 class WebViewTranslateClient
     : public translate::TranslateClient,
       public web::WebStateObserver,
       public web::WebStateUserData<WebViewTranslateClient> {
  public:
+  ~WebViewTranslateClient() override;
+
   // Sets the delegate passed by the embedder.
   // |delegate| is assumed to outlive this WebViewTranslateClient.
   void set_translate_delegate(id<CWVTranslateDelegate> delegate) {
     delegate_.reset(delegate);
   }
 
  private:
   friend class web::WebStateUserData<WebViewTranslateClient>;
 
   // The lifetime of WebViewTranslateClient is managed by WebStateUserData.
   explicit WebViewTranslateClient(web::WebState* web_state);
-  ~WebViewTranslateClient() override;
 
   // TranslateClient implementation.
   translate::TranslateDriver* GetTranslateDriver() override;
   PrefService* GetPrefs() override;
   std::unique_ptr<translate::TranslatePrefs> GetTranslatePrefs() override;
   translate::TranslateAcceptLanguages* GetTranslateAcceptLanguages() override;
   int GetInfobarIconID() const override;
   std::unique_ptr<infobars::InfoBar> CreateInfoBar(
       std::unique_ptr<translate::TranslateInfoBarDelegate> delegate)
       const override;
@@ skipping 13 matching lines @@
 
   // Delegate provided by the embedder.
   base::WeakNSProtocol<id<CWVTranslateDelegate>> delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(WebViewTranslateClient);
 };
 
 }  // namespace ios_web_view
 
 #endif  // IOS_WEB_VIEW_INTERNAL_TRANSLATE_WEB_VIEW_TRANSLATE_CLIENT_H_