Convert //ios/web_view/internal to ARC.

ios/web_view/internal/criwv_web_main_parts.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_CRIWV_WEB_MAIN_PARTS_H_
 #define IOS_WEB_VIEW_INTERNAL_CRIWV_WEB_MAIN_PARTS_H_
 
 #include "ios/web/public/app/web_main_parts.h"
 
 #include <memory>
@@ skipping 15 matching lines @@
   // Returns the CRIWVBrowserState for this embedder.
   CRIWVBrowserState* browser_state() const { return browser_state_.get(); }
 
   // Returns the off the record CRIWVBrowserState for this embedder.
   CRIWVBrowserState* off_the_record_browser_state() const {
     return off_the_record_browser_state_.get();
   }
 
  private:
   // This object's delegate.
-  id<CRIWVDelegate> delegate_;
+  __unsafe_unretained id<CRIWVDelegate> delegate_;
 
   // The BrowserState for this embedder.
   std::unique_ptr<CRIWVBrowserState> browser_state_;
 
   // The BrowserState for this embedder.
   std::unique_ptr<CRIWVBrowserState> off_the_record_browser_state_;
 };
 
 }  // namespace ios_web_view
 
 #endif  // IOS_WEB_VIEW_INTERNAL_CRIWV_WEB_MAIN_PARTS_H_