Renames SessionChanges and SessionCellData to have a TabSwitcher prefix.

ios/chrome/browser/ui/tab_switcher/tab_switcher_header_view.mm

Index: ios/chrome/browser/ui/tab_switcher/tab_switcher_header_view.mm
diff --git a/ios/chrome/browser/ui/tab_switcher/tab_switcher_header_view.mm b/ios/chrome/browser/ui/tab_switcher/tab_switcher_header_view.mm
index bcaec6550fe76a7c3f34b49a1e41bb3215fff010..140d6eadf8d56aa0e00277cff746b865a4d381ef 100644
--- a/ios/chrome/browser/ui/tab_switcher/tab_switcher_header_view.mm
+++ b/ios/chrome/browser/ui/tab_switcher/tab_switcher_header_view.mm
@@ -334,7 +334,7 @@ enum PanelSelectionChangeDirection { RIGHT, LEFT };
 
 - (NSString*)panelTitleAtIndex:(NSInteger)index {
   NSIndexPath* indexPath = [NSIndexPath indexPathForItem:index inSection:0];
-  SessionCellData* sessionCellData =
+  TabSwitcherSessionCellData* sessionCellData =
       [[self dataSource] sessionCellDataAtIndex:indexPath.row];
   return sessionCellData.title;
 }
@@ -373,7 +373,7 @@ enum PanelSelectionChangeDirection { RIGHT, LEFT };
   TabSwitcherHeaderCell* headerCell = [collectionView
       dequeueReusableCellWithReuseIdentifier:[TabSwitcherHeaderCell identifier]
                                 forIndexPath:indexPath];
-  SessionCellData* sessionCellData =
+  TabSwitcherSessionCellData* sessionCellData =
       [[self dataSource] sessionCellDataAtIndex:indexPath.row];
   [headerCell loadSessionCellData:sessionCellData];
   return headerCell;