Update shelf spacing in Chrome OS according to the MD specs

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 a2a083e4d12aa783f46446af33bf6bbbc3b942c9..17f84dbf1a357bbb7ee39a018880e1e3b0437d5b 100644
--- a/ash/shelf/shelf_view_unittest.cc
+++ b/ash/shelf/shelf_view_unittest.cc
@@ -309,7 +309,7 @@ class ShelfViewTest : public AshTestBase {
     shelf_view_ = ShelfTestAPI(shelf).shelf_view();
 
     // The bounds should be big enough for 4 buttons + overflow chevron.
-    shelf_view_->SetBounds(0, 0, 500, kShelfSize);
+    shelf_view_->SetBounds(0, 0, 500, GetShelfLayoutConstant(SHELF_SIZE));
 
     test_api_.reset(new ShelfViewTestAPI(shelf_view_));
     test_api_->SetAnimationDuration(1);  // Speeds up animation for test.
@@ -1584,7 +1584,7 @@ TEST_F(ShelfViewTest, ResizeDuringOverflowAddAnimation) {
 
   // Resize shelf view with that animation running and stay overflown.
   gfx::Rect bounds = shelf_view_->bounds();
-  bounds.set_width(bounds.width() - kShelfSize);
+  bounds.set_width(bounds.width() - GetShelfLayoutConstant(SHELF_SIZE));
   shelf_view_->SetBoundsRect(bounds);
   ASSERT_TRUE(test_api_->IsOverflowButtonVisible());
 
@@ -1719,7 +1719,8 @@ TEST_F(ShelfViewTest, CheckDragInsertBoundsWithMultiMonitor) {
       ShelfTestAPI(secondary_shelf).shelf_view();
 
   // The bounds should be big enough for 4 buttons + overflow chevron.
-  shelf_view_for_secondary->SetBounds(0, 0, 500, kShelfSize);
+  shelf_view_for_secondary->SetBounds(0, 0, 500,
+                                      GetShelfLayoutConstant(SHELF_SIZE));
 
   ShelfViewTestAPI test_api_for_secondary(shelf_view_for_secondary);
   // Speeds up animation for test.