Remove unused ash::SHELF_ALIGNMENT_TOP

ash/system/tray/tray_item_view.cc

Index: ash/system/tray/tray_item_view.cc
diff --git a/ash/system/tray/tray_item_view.cc b/ash/system/tray/tray_item_view.cc
index b338358f0c9b3aaddd2995b2a2d6697a3912606b..a1a749aed7805eb5357d46b1895838ef0ac47a1f 100644
--- a/ash/system/tray/tray_item_view.cc
+++ b/ash/system/tray/tray_item_view.cc
@@ -85,15 +85,13 @@ int TrayItemView::GetAnimationDurationMS() {
 
 gfx::Size TrayItemView::GetPreferredSize() const {
   gfx::Size size = DesiredSize();
-  if (owner()->system_tray()->shelf_alignment() == SHELF_ALIGNMENT_BOTTOM ||
-      owner()->system_tray()->shelf_alignment() == SHELF_ALIGNMENT_TOP)
+  if (owner()->system_tray()->shelf_alignment() == SHELF_ALIGNMENT_BOTTOM)
     size.set_height(kTrayIconHeight);
   else
     size.set_width(kTrayIconWidth);
   if (!animation_.get() || !animation_->is_animating())
     return size;
-  if (owner()->system_tray()->shelf_alignment() == SHELF_ALIGNMENT_BOTTOM ||
-      owner()->system_tray()->shelf_alignment() == SHELF_ALIGNMENT_TOP) {
+  if (owner()->system_tray()->shelf_alignment() == SHELF_ALIGNMENT_BOTTOM) {
     size.set_width(std::max(1,
         static_cast<int>(size.width() * animation_->GetCurrentValue())));
   } else {
@@ -113,8 +111,7 @@ void TrayItemView::ChildPreferredSizeChanged(views::View* child) {
 
 void TrayItemView::AnimationProgressed(const gfx::Animation* animation) {
   gfx::Transform transform;
-  if (owner()->system_tray()->shelf_alignment() == SHELF_ALIGNMENT_BOTTOM ||
-      owner()->system_tray()->shelf_alignment() == SHELF_ALIGNMENT_TOP) {
+  if (owner()->system_tray()->shelf_alignment() == SHELF_ALIGNMENT_BOTTOM) {
     transform.Translate(0, animation->CurrentValueBetween(
         static_cast<double>(height()) / 2, 0.));
   } else {