ui: Cleanup class/struct forward declarations

ash/common/system/user/tray_user.cc

Index: ash/common/system/user/tray_user.cc
diff --git a/ash/common/system/user/tray_user.cc b/ash/common/system/user/tray_user.cc
index f0a0e4aed1643356807f0539dc652206cf0a366e..c061d4d6dcfa0a2501ce95f9dd0986758d5bdde2 100644
--- a/ash/common/system/user/tray_user.cc
+++ b/ash/common/system/user/tray_user.cc
@@ -192,7 +192,7 @@ void TrayUser::UpdateAfterShelfAlignmentChange(ShelfAlignment alignment) {
       int height = label_->GetContentsBounds().height();
       int vertical_pad = (kTrayItemSize - height) / 2;
       int remainder = height % 2;
-      label_->SetBorder(views::Border::CreateEmptyBorder(
+      label_->SetBorder(views::CreateEmptyBorder(
           vertical_pad + remainder,
           kTrayLabelItemHorizontalPaddingBottomAlignment, vertical_pad,
           kTrayLabelItemHorizontalPaddingBottomAlignment));
@@ -205,7 +205,7 @@ void TrayUser::UpdateAfterShelfAlignmentChange(ShelfAlignment alignment) {
                               kTrayRoundedBorderRadius);
     }
     if (label_) {
-      label_->SetBorder(views::Border::CreateEmptyBorder(
+      label_->SetBorder(views::CreateEmptyBorder(
           kTrayLabelItemVerticalPaddingVerticalAlignment,
           kTrayLabelItemHorizontalPaddingBottomAlignment,
           kTrayLabelItemVerticalPaddingVerticalAlignment,