[ash-md] Remove non-md code from the Shelf background animations.

ash/common/shelf/overflow_bubble_view.cc

Index: ash/common/shelf/overflow_bubble_view.cc
diff --git a/ash/common/shelf/overflow_bubble_view.cc b/ash/common/shelf/overflow_bubble_view.cc
index 25b0ef672dba7790057570679b0c2f6c15d0415a..a198d095aa0202d40b7c5605699a07f6de1c8828 100644
--- a/ash/common/shelf/overflow_bubble_view.cc
+++ b/ash/common/shelf/overflow_bubble_view.cc
@@ -52,8 +52,7 @@ void OverflowBubbleView::InitOverflowBubble(views::View* anchor,
   set_background(NULL);
   SkColor color = MaterialDesignController::IsShelfMaterial()
                       ? kShelfBaseColor
-                      : SkColorSetA(kShelfBaseColor,
-                                    GetShelfConstant(SHELF_BACKGROUND_ALPHA));
+                      : SkColorSetA(kShelfBaseColor, kShelfTranslucentAlpha);
   set_color(color);
   set_margins(gfx::Insets(kPadding, kPadding, kPadding, kPadding));
   // Overflow bubble should not get focus. If it get focus when it is shown,