Update the maximize button when size constraints change.

ui/views/widget/widget.h

Index: ui/views/widget/widget.h
diff --git a/ui/views/widget/widget.h b/ui/views/widget/widget.h
index fad55064589842a6412c84eeaedc38684f20d8de..96ab8b2ebff3aa936a9d74fc24f64a9d6e31e8b3 100644
--- a/ui/views/widget/widget.h
+++ b/ui/views/widget/widget.h
@@ -732,6 +732,9 @@ class VIEWS_EXPORT Widget : public internal::NativeWidgetDelegate,
   // Whether the widget supports translucency.
   bool IsTranslucentWindowOpacitySupported() const;
 
+  // Called when the delegate's CanResize or CanMaximize changes.
+  void OnSizeConstraintsChanged();
+
   // Notification that our owner is closing.
   // NOTE: this is not invoked for aura as it's currently not needed there.
   // Under aura menus close by way of activation getting reset when the owner