Renames SessionChanges and SessionCellData to have a TabSwitcher prefix.

ios/chrome/browser/ui/tab_switcher/tab_switcher_header_view.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_HEADER_VIEW_H_
 #define IOS_CHROME_BROWSER_UI_TAB_SWITCHER_TAB_SWITCHER_HEADER_VIEW_H_
 
 #import <UIKit/UIKit.h>
 
 #include "base/ios/block_types.h"
 
-@class SessionCellData;
+@class TabSwitcherSessionCellData;
 @class TabSwitcherHeaderView;
 
 @protocol TabSwitcherHeaderViewDelegate<NSObject>
 
 - (void)tabSwitcherHeaderViewDismiss:(TabSwitcherHeaderView*)view;
 - (void)tabSwitcherHeaderViewDidSelectSessionAtIndex:(NSInteger)index;
 // Called to get the currently selected panel index. Returns NSNotFound when no
 // panel is selected.
 - (NSInteger)tabSwitcherHeaderViewSelectedPanelIndex;
 
 @end
 
 @protocol TabSwitcherHeaderViewDataSource<NSObject>
 
 - (NSInteger)tabSwitcherHeaderViewSessionCount;
-- (SessionCellData*)sessionCellDataAtIndex:(NSUInteger)index;
+- (TabSwitcherSessionCellData*)sessionCellDataAtIndex:(NSUInteger)index;
 
 @end
 
 @interface TabSwitcherHeaderView : UIView
 
 @property(nonatomic, assign) id<TabSwitcherHeaderViewDelegate> delegate;
 @property(nonatomic, assign) id<TabSwitcherHeaderViewDataSource> dataSource;
 @property(nonatomic, readonly) UIView* dismissButton;
 
 // Selects the item at the specified index.
@@ skipping 16 matching lines @@
 // Update methods takes arrays of NSNumbers.
 - (void)insertSessionsAtIndexes:(NSArray*)indexes;
 - (void)removeSessionsAtIndexes:(NSArray*)indexes;
 
 // Returns the accessibility title of the panel at index |index|.
 - (NSString*)panelTitleAtIndex:(NSInteger)index;
 
 @end
 
 #endif  // IOS_CHROME_BROWSER_UI_TAB_SWITCHER_TAB_SWITCHER_HEADER_VIEW_H_