Revert of [ObjC ARC] Converts ios/chrome/browser/ui/stack_view:stack_view to ARC.

ios/chrome/browser/ui/stack_view/card_stack_layout_manager.h

Index: ios/chrome/browser/ui/stack_view/card_stack_layout_manager.h
diff --git a/ios/chrome/browser/ui/stack_view/card_stack_layout_manager.h b/ios/chrome/browser/ui/stack_view/card_stack_layout_manager.h
index ca23b74d2ef857742566d2083699a2f48bfa2679..54d942833a1f085e45e736bf4c1b37adb5d3b9d0 100644
--- a/ios/chrome/browser/ui/stack_view/card_stack_layout_manager.h
+++ b/ios/chrome/browser/ui/stack_view/card_stack_layout_manager.h
@@ -15,7 +15,15 @@
 // Encapsulates a stack of cards and their layout behavior, supporting
 // fanning the cards out along an axis and gathering them to fit in a given
 // area.
-@interface CardStackLayoutManager : NSObject
+@interface CardStackLayoutManager : NSObject {
+ @private
+  base::scoped_nsobject<NSMutableArray> cards_;
+  // YES if the previous call to one of {|scrollCardAtIndex|,
+  // |handleMultitouchWithFirstDelta|} was to the former method; NO otherwise.
+  BOOL treatOverExtensionAsScroll_;
+  NSUInteger previousFirstPinchCardIndex_;
+  NSUInteger previousSecondPinchCardIndex_;
+}
 
 // The size of a card. Setting this property preserves card origins with the
 // exception that cards are moved as necessary to satisfy placement constraints