Convert //ios/web_view/internal to ARC.

ios/web_view/internal/criwv_web_view.mm

 // 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.
 
 #import "ios/web_view/public/criwv_web_view.h"
 
 #include <memory>
 #include <utility>
 
 #import "base/ios/weak_nsobject.h"
 #include "base/memory/ptr_util.h"
 #include "base/strings/sys_string_conversions.h"
 #import "ios/web/public/navigation_manager.h"
 #include "ios/web/public/referrer.h"
+#import "ios/web/public/web_state/js/crw_js_injection_receiver.h"
 #import "ios/web/public/web_state/ui/crw_web_delegate.h"
 #import "ios/web/public/web_state/web_state.h"
 #import "ios/web/public/web_state/web_state_delegate_bridge.h"
 #import "ios/web/public/web_state/web_state_observer_bridge.h"
 #include "ios/web_view/internal/criwv_browser_state.h"
 #import "ios/web_view/internal/criwv_website_data_store_internal.h"
 #import "ios/web_view/internal/translate/criwv_translate_client.h"
 #import "ios/web_view/public/criwv_web_view_configuration.h"
 #import "ios/web_view/public/criwv_web_view_delegate.h"
 #import "ios/web_view/public/criwv_website_data_store.h"
 #import "net/base/mac/url_conversions.h"
 #include "ui/base/page_transition_types.h"
 #include "url/gurl.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 @interface CRIWVWebView ()<CRWWebStateDelegate, CRWWebStateObserver> {
-  id<CRIWVWebViewDelegate> _delegate;
   CRIWVWebViewConfiguration* _configuration;
   std::unique_ptr<web::WebState> _webState;
   std::unique_ptr<web::WebStateDelegateBridge> _webStateDelegate;
   std::unique_ptr<web::WebStateObserverBridge> _webStateObserver;
   CGFloat _loadProgress;
 }
 
 @end
 
 @implementation CRIWVWebView
@@ skipping 134 matching lines @@
                     loadSuccess:success];
   }
 }
 
 - (void)webState:(web::WebState*)webState
     didChangeLoadingProgress:(double)progress {
   [self notifyDidUpdateWithChanges:CRIWVWebViewUpdateTypeProgress];
 }
 
 @end