Enables hot-tracking for overflow extension buttons in the app menu

ui/views/controls/menu/menu_scroll_view_container.cc

Index: ui/views/controls/menu/menu_scroll_view_container.cc
diff --git a/ui/views/controls/menu/menu_scroll_view_container.cc b/ui/views/controls/menu/menu_scroll_view_container.cc
index 05c8caedb5505b4ac7c596195ec5d4aa02a4f7f0..09f8ed6234af805c1aba8f01f656c03678939db2 100644
--- a/ui/views/controls/menu/menu_scroll_view_container.cc
+++ b/ui/views/controls/menu/menu_scroll_view_container.cc
@@ -75,8 +75,7 @@ class MenuScrollButton : public View {
 
     // The background.
     gfx::Rect item_bounds(0, 0, width(), height());
-    NativeTheme::ExtraParams extra;
-    extra.menu_item.is_selected = false;
+    NativeTheme::ExtraParams extra = NativeTheme::ExtraParams();
     GetNativeTheme()->Paint(canvas->sk_canvas(),
                             NativeTheme::kMenuItemBackground,
                             NativeTheme::kNormal, item_bounds, extra);