[ObjC ARC] Converts ios/chrome/browser/ui/ntp:ntp_internal to ARC.

ios/chrome/browser/ui/ntp/new_tab_page_panel_protocol.h

Index: ios/chrome/browser/ui/ntp/new_tab_page_panel_protocol.h
diff --git a/ios/chrome/browser/ui/ntp/new_tab_page_panel_protocol.h b/ios/chrome/browser/ui/ntp/new_tab_page_panel_protocol.h
index 1ceb02dadaaa39b3778f7dabea96b7626d554457..ebbe00050c7c0c705292db2fd4aa109611eff97a 100644
--- a/ios/chrome/browser/ui/ntp/new_tab_page_panel_protocol.h
+++ b/ios/chrome/browser/ui/ntp/new_tab_page_panel_protocol.h
@@ -35,13 +35,13 @@ extern const int kNewTabPageDistanceToFadeShadow;
 @protocol NewTabPagePanelProtocol<NewTabPagePanelControllerSnapshotting>
 
 // NewTabPagePanelController delegate, may be nil.
-@property(nonatomic, assign) id<NewTabPagePanelControllerDelegate> delegate;
+@property(nonatomic, weak) id<NewTabPagePanelControllerDelegate> delegate;
 
 // Alpha value to use for the NewTabPageBar shadow.
 @property(nonatomic, readonly) CGFloat alphaForBottomShadow;
 
 // Main view.
-@property(nonatomic, readonly) UIView* view;
+@property(nonatomic, readonly, strong) UIView* view;
 
 // Reload any displayed data to ensure the view is up to date.
 - (void)reload;