Update shelf spacing in Chrome OS according to the MD specs

ash/system/toast/toast_manager_unittest.cc

Index: ash/system/toast/toast_manager_unittest.cc
diff --git a/ash/system/toast/toast_manager_unittest.cc b/ash/system/toast/toast_manager_unittest.cc
index fc6ec7f6941e209ee3e12b47cd72112ffa0a6f35..b3ba21e37d30357248fb1be4b57f809699c94088 100644
--- a/ash/system/toast/toast_manager_unittest.cc
+++ b/ash/system/toast/toast_manager_unittest.cc
@@ -5,6 +5,7 @@
 #include "ash/display/display_manager.h"
 #include "ash/screen_util.h"
 #include "ash/shelf/shelf.h"
+#include "ash/shelf/shelf_constants.h"
 #include "ash/shelf/shelf_layout_manager.h"
 #include "ash/shell.h"
 #include "ash/system/toast/toast_manager.h"
@@ -187,8 +188,7 @@ TEST_F(ToastManagerTest, PositionWithAutoHiddenBottomShelf) {
 
   EXPECT_TRUE(toast_bounds.Intersects(shelf->user_work_area_bounds()));
   EXPECT_NEAR(root_bounds.CenterPoint().x(), toast_bounds.CenterPoint().x(), 1);
-  EXPECT_EQ(root_bounds.bottom() - ShelfLayoutManager::kAutoHideSize - 5,
-            toast_bounds.bottom());
+  EXPECT_EQ(root_bounds.bottom() - kAutoHideSize - 5, toast_bounds.bottom());
 }
 
 TEST_F(ToastManagerTest, PositionWithHiddenBottomShelf) {