Fix issue on <select> style change when popup is visible

Source/web/PopupListBox.h

Index: Source/web/PopupListBox.h
diff --git a/Source/web/PopupListBox.h b/Source/web/PopupListBox.h
index d3da7d104d0478d4f447c09e629336b920c60508..025f615947a6467bf196738c1f95621b2ca02203 100644
--- a/Source/web/PopupListBox.h
+++ b/Source/web/PopupListBox.h
@@ -262,12 +262,6 @@ private:
     // selection by clicking or pressing enter yet however.
     int m_selectedIndex;
 
-    // If >= 0, this is the index we should accept if the popup is "abandoned".
-    // This is used for keyboard navigation, where we want the
-    // selection to change immediately, and is only used if the settings
-    // acceptOnAbandon field is true.
-    int m_acceptedIndexOnAbandon;
-
     // This is the number of rows visible in the popup. The maximum number
     // visible at a time is defined as being kMaxVisibleRows. For a scrolled
     // popup, this can be thought of as the page size in data units.