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

ios/web/web_state/ui/crw_web_controller_container_view.h

Index: ios/web/web_state/ui/crw_web_controller_container_view.h
diff --git a/ios/web/web_state/ui/crw_web_controller_container_view.h b/ios/web/web_state/ui/crw_web_controller_container_view.h
index c24af8337a9016a636b2f561e80633bab90aabf1..06a812b067ec4646d94e21f77bf9116e4930a52f 100644
--- a/ios/web/web_state/ui/crw_web_controller_container_view.h
+++ b/ios/web/web_state/ui/crw_web_controller_container_view.h
@@ -33,12 +33,12 @@
 
 #pragma mark Content Views
 // The web view content view being displayed.
-@property(nonatomic, retain, readonly)
+@property(nonatomic, strong, readonly)
     CRWWebViewContentView* webViewContentView;
 // The native controller whose content is being displayed.
-@property(nonatomic, retain, readonly) id<CRWNativeContent> nativeController;
+@property(nonatomic, strong, readonly) id<CRWNativeContent> nativeController;
 // The currently displayed transient content view.
-@property(nonatomic, retain, readonly) CRWContentView* transientContentView;
+@property(nonatomic, strong, readonly) CRWContentView* transientContentView;
 
 // Designated initializer.  |proxy|'s content view will be updated as different
 // content is added to the container.
@@ -46,6 +46,8 @@
         (id<CRWWebControllerContainerViewDelegate>)delegate
     NS_DESIGNATED_INITIALIZER;
 
+- (void)setDelegate:(id<CRWWebControllerContainerViewDelegate>)delegate;
+
 // CRWWebControllerContainerView should be initialized via
 // |-initWithContentViewProxy:|.
 - (instancetype)initWithCoder:(NSCoder*)decoder NS_UNAVAILABLE;