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

ios/web/web_state/ui/crw_web_controller.h

Index: ios/web/web_state/ui/crw_web_controller.h
diff --git a/ios/web/web_state/ui/crw_web_controller.h b/ios/web/web_state/ui/crw_web_controller.h
index a926691bf3179a4439ccee32162a97cccbfea286..d95c41c683e0afec9522ef89c7134ea20037ad59 100644
--- a/ios/web/web_state/ui/crw_web_controller.h
+++ b/ios/web/web_state/ui/crw_web_controller.h
@@ -72,24 +72,24 @@ class WebStateImpl;
 // Defaults to NO; this should be enabled before attempting to access the view.
 @property(nonatomic, assign) BOOL webUsageEnabled;
 
-@property(nonatomic, assign) id<CRWWebDelegate> delegate;
+@property(nonatomic, weak) id<CRWWebDelegate> delegate;
 @property(nonatomic, weak) id<CRWWebUserInterfaceDelegate> UIDelegate;
-@property(nonatomic, assign) id<CRWNativeContentProvider> nativeProvider;
-@property(nonatomic, assign)
-    id<CRWSwipeRecognizerProvider> swipeRecognizerProvider;
+@property(nonatomic, weak) id<CRWNativeContentProvider> nativeProvider;
+@property(nonatomic, weak) id<CRWSwipeRecognizerProvider>
+    swipeRecognizerProvider;
 @property(nonatomic, readonly) web::WebState* webState;
 @property(nonatomic, readonly) web::WebStateImpl* webStateImpl;
 
 // The container view used to display content.  If the view has been purged due
 // to low memory, this will recreate it.
-@property(nonatomic, readonly) UIView* view;
+@property(weak, nonatomic, readonly) UIView* view;
 
 // The web view proxy associated with this controller.
-@property(nonatomic, readonly) id<CRWWebViewProxy> webViewProxy;
+@property(weak, nonatomic, readonly) id<CRWWebViewProxy> webViewProxy;
 
 // The view that generates print data when printing. It is nil if printing
 // is not supported.
-@property(nonatomic, readonly) UIView* viewForPrinting;
+@property(weak, nonatomic, readonly) UIView* viewForPrinting;
 
 // Content view was reset due to low memory.  Use placeholder overlay view on
 // next creation.