Remove unused ash::SHELF_ALIGNMENT_TOP

ash/shelf/shelf_view_unittest.cc

Index: ash/shelf/shelf_view_unittest.cc
diff --git a/ash/shelf/shelf_view_unittest.cc b/ash/shelf/shelf_view_unittest.cc
index 68ebf31bedb4c307383c8fc8627418727b0deb83..3aaa788ca8aa2c15a8598fcd5b43ba7efd6215f1 100644
--- a/ash/shelf/shelf_view_unittest.cc
+++ b/ash/shelf/shelf_view_unittest.cc
@@ -959,7 +959,6 @@ TEST_F(ShelfViewTest, AssertNoButtonsOverlap) {
   const ShelfAlignment kAlignments[] = {
       SHELF_ALIGNMENT_LEFT,
       SHELF_ALIGNMENT_RIGHT,
-      SHELF_ALIGNMENT_TOP,
       SHELF_ALIGNMENT_BOTTOM
   };
 
@@ -983,8 +982,7 @@ TEST_F(ShelfViewTest, AssertNoButtonsOverlap) {
 // Making sure the overflow bubble arrow correctly tracks with shelf position.
 TEST_F(ShelfViewTest, OverflowArrowForShelfPosition) {
   const ShelfAlignment kAlignments[] = {
-      SHELF_ALIGNMENT_BOTTOM, SHELF_ALIGNMENT_LEFT, SHELF_ALIGNMENT_RIGHT,
-      SHELF_ALIGNMENT_TOP};
+      SHELF_ALIGNMENT_BOTTOM, SHELF_ALIGNMENT_LEFT, SHELF_ALIGNMENT_RIGHT};
 
   // These must match what is expected for each alignment above.
   const views::BubbleBorder::Arrow kArrows[] = {