Enable ARC for //ios/web_view/internal/translate/*.m.

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>
 
+#import "base/ios/weak_nsobject.h"
 #include "components/translate/core/browser/translate_client.h"
 #include "components/translate/core/browser/translate_step.h"
 #include "components/translate/core/common/translate_errors.h"
 #import "components/translate/ios/browser/ios_translate_driver.h"
 #include "ios/web/public/web_state/web_state_observer.h"
 #import "ios/web/public/web_state/web_state_user_data.h"
+#import "ios/web_view/public/cwv_translate_delegate.h"
 
-@protocol CWVTranslateDelegate;
 class PrefService;
 
 namespace translate {
 class TranslateAcceptLanguages;
 class TranslatePrefs;
 class TranslateManager;
 }  // namespace translate
 
 namespace web {
 class WebState;
 }
 
 namespace ios_web_view {
 
 class WebViewTranslateClient
     : public translate::TranslateClient,
       public web::WebStateObserver,
       public web::WebStateUserData<WebViewTranslateClient> {
  public:
   // Sets the delegate passed by the embedder.
   // |delegate| is assumed to outlive this WebViewTranslateClient.
   void set_translate_delegate(id<CWVTranslateDelegate> delegate) {
-    delegate_ = 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.
@@ skipping 13 matching lines @@
   bool IsTranslatableURL(const GURL& url) override;
   void ShowReportLanguageDetectionErrorUI(const GURL& report_url) override;
 
   // web::WebStateObserver implementation.
   void WebStateDestroyed() override;
 
   std::unique_ptr<translate::TranslateManager> translate_manager_;
   translate::IOSTranslateDriver translate_driver_;
 
   // Delegate provided by the embedder.
-  id<CWVTranslateDelegate> delegate_;  // Weak.
+  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_