Fix for voice-over accessibility issue with tab switcher.

ios/chrome/browser/ui/tab_switcher/tab_switcher_panel_cell.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_CHROME_BROWSER_UI_TAB_SWITCHER_TAB_SWITCHER_PANEL_CELL_H_
 #define IOS_CHROME_BROWSER_UI_TAB_SWITCHER_TAB_SWITCHER_PANEL_CELL_H_
 
 #import <UIKit/UIKit.h>
 
 #import "ios/chrome/browser/ui/tab_switcher/tab_switcher_model.h"
@@ skipping 13 matching lines @@
 - (void)cellPressed:(UICollectionViewCell*)cell;
 - (void)deleteButtonPressedForCell:(UICollectionViewCell*)cell;
 
 @end
 
 @interface TabSwitcherSessionCell : UICollectionViewCell
 
 // Returns the cell's identifier used for the cell's re-use.
 + (NSString*)identifier;
 
+// The cell delegate.
+@property(nonatomic, assign) id<SessionCellDelegate> delegate;
+
 @end
 
 // Cell showing information about a local session.
 @interface TabSwitcherLocalSessionCell : TabSwitcherSessionCell
 
 // Returns the top bar of the cell. The top bar holds the favicon and the tab
 // title.
 @property(nonatomic, readonly) UIView* topBar;
 
 // Sets the cell's appearance using information in |tab|.
 - (void)setAppearanceForTab:(Tab*)tab cellSize:(CGSize)cellSize;
 // Sets the cell's appearance depending on |type|.
 - (void)setSessionType:(TabSwitcherSessionType)type;
-// Sets the cell's delegate.
-- (void)setDelegate:(id<SessionCellDelegate>)delegate;
 
 // Returns the current screenshot set on the cell.
 - (UIImage*)screenshot;
 // Sets the snapshot.
 - (void)setSnapshot:(UIImage*)snapshot;
 
 @end
 
 @interface TabSwitcherDistantSessionCell : TabSwitcherSessionCell
 
 // Sets the cell's title.
 - (void)setTitle:(NSString*)title;
 // Sets the session's URL to obtain the cell's favicon.
 - (void)setSessionGURL:(GURL const&)gurl
       withBrowserState:(ios::ChromeBrowserState*)browserState;
-// Sets the cell's delegate.
-- (void)setDelegate:(id<SessionCellDelegate>)delegate;
 
 @end
 
 #endif  // IOS_CHROME_BROWSER_UI_TAB_SWITCHER_TAB_SWITCHER_PANEL_CELL_H_