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

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

 // Copyright 2012 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_CHROME_BROWSER_UI_NTP_NEW_TAB_PAGE_PANEL_PROTOCOL_H_
 #define IOS_CHROME_BROWSER_UI_NTP_NEW_TAB_PAGE_PANEL_PROTOCOL_H_
 
 #import <UIKit/UIKit.h>
 
 @protocol NewTabPagePanelProtocol;
@@ skipping 17 matching lines @@
 // Called when a snapshot of the content will be taken.
 - (void)willUpdateSnapshot;
 
 @end
 
 // Base class of a controller for the panels in the New Tab Page. This should
 // not be instantiated, but instead one of its sub-classes.
 @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;
 
 // Notifies the NewTabPagePanelProtocol that it has been shown.
 - (void)wasShown;
 
 // Notifies the NewTabPagePanelProtocol that it has been hidden.
 - (void)wasHidden;
 
 // Dismisses any modal interaction elements.
 - (void)dismissModals;
 
 // Dismisses on-screen keyboard if necessary.
 - (void)dismissKeyboard;
 
 // Disable and enable scrollToTop
 - (void)setScrollsToTop:(BOOL)enable;
 
 @end
 
 #endif  // IOS_CHROME_BROWSER_UI_NTP_NEW_TAB_PAGE_PANEL_PROTOCOL_H_