ui: Cleanup class/struct forward declarations

ash/common/system/status_area_widget_delegate.cc

Index: ash/common/system/status_area_widget_delegate.cc
diff --git a/ash/common/system/status_area_widget_delegate.cc b/ash/common/system/status_area_widget_delegate.cc
index 81ae0599e111c33f28a55729d367cde6447ac112..307053b85f1fc0013bd9967611d75a15a298657a 100644
--- a/ash/common/system/status_area_widget_delegate.cc
+++ b/ash/common/system/status_area_widget_delegate.cc
@@ -246,8 +246,8 @@ void StatusAreaWidgetDelegate::SetBorderOnChild(views::View* child,
       right_edge = shelf_size - kShelfItemInset - item_height;
     }
   }
-  child->SetBorder(views::Border::CreateEmptyBorder(top_edge, left_edge,
-                                                    bottom_edge, right_edge));
+  child->SetBorder(
+      views::CreateEmptyBorder(top_edge, left_edge, bottom_edge, right_edge));
   // Layout on |child| needs to be updated based on new border value before
   // displaying; otherwise |child| will be showing with old border size.
   // Fix for crbug.com/623438.