[Payments] Change how the dialog gets destroyed.

chrome/browser/ui/views/payments/view_stack.h

Index: chrome/browser/ui/views/payments/view_stack.h
diff --git a/chrome/browser/ui/views/payments/view_stack.h b/chrome/browser/ui/views/payments/view_stack.h
index 8b94104160ab1e8b66c0f4dde2f4b1299076b163..5b48c6de8c5dcbd5b102c6d8ca55a3fca10a9eec 100644
--- a/chrome/browser/ui/views/payments/view_stack.h
+++ b/chrome/browser/ui/views/payments/view_stack.h
@@ -59,11 +59,13 @@ class ViewStack : public views::BoundsAnimatorObserver,
   void OnBoundsAnimatorProgressed(views::BoundsAnimator* animator) override {}
   void OnBoundsAnimatorDone(views::BoundsAnimator* animator) override;
 
-  std::vector<std::unique_ptr<views::View>> stack_;
-
   std::unique_ptr<views::BoundsAnimator> slide_in_animator_;
   std::unique_ptr<views::BoundsAnimator> slide_out_animator_;
 
+  // Should be the last member, because views need to be destroyed before other
+  // members, and members are destroyed in reverse order of their creation.
+  std::vector<std::unique_ptr<views::View>> stack_;
+
   DISALLOW_COPY_AND_ASSIGN(ViewStack);
 };