[ARC] Converts part of ios/web/ui to ARC.

ios/web/public/web_state/ui/crw_generic_content_view.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_PUBLIC_WEB_STATE_UI_CRW_GENERIC_CONTENT_VIEW_H_
 #define IOS_WEB_PUBLIC_WEB_STATE_UI_CRW_GENERIC_CONTENT_VIEW_H_
 
 #include "ios/web/public/web_state/ui/crw_content_view.h"
 
 // Wraps an arbitrary native UIView in a CRWContentView.
 @interface CRWGenericContentView : CRWContentView
 
 // The view that was passed to |-initWithContentView:|.  This is the view that
 // is displayed in |self.scrollView|.
-@property(nonatomic, retain, readonly) UIView* view;
+@property(nonatomic, strong, readonly) UIView* view;
 
 // Initializes the CRWNativeContentContainerView to display |view|, which
 // will be added to the scroll view.
 - (instancetype)initWithView:(UIView*)view NS_DESIGNATED_INITIALIZER;
 
 // CRWGenericContentViews should be initialized via |-initWithView:|.
 - (instancetype)initWithCoder:(NSCoder*)decoder NS_UNAVAILABLE;
 - (instancetype)initWithFrame:(CGRect)frame NS_UNAVAILABLE;
 
 @end
 
 #endif  // IOS_WEB_PUBLIC_WEB_STATE_UI_CRW_GENERIC_CONTENT_VIEW_H_