Parametrize some more constants that will be changing in MD.

chrome/browser/ui/views/frame/glass_browser_frame_view.cc

Index: chrome/browser/ui/views/frame/glass_browser_frame_view.cc
diff --git a/chrome/browser/ui/views/frame/glass_browser_frame_view.cc b/chrome/browser/ui/views/frame/glass_browser_frame_view.cc
index 835dee83f79cb900652390bd3aa1cf895103fc62..7b5a4406bbfa533a4bafce18bccb963185af6a75 100644
--- a/chrome/browser/ui/views/frame/glass_browser_frame_view.cc
+++ b/chrome/browser/ui/views/frame/glass_browser_frame_view.cc
@@ -112,8 +112,8 @@ gfx::Rect GlassBrowserFrameView::GetBoundsForTabStrip(
     // In non-maximized mode, allow the new tab button to slide completely under
     // the avatar button.
     if (!frame()->IsMaximized() && !base::i18n::IsRTL()) {
-      end_x +=
-          TabStrip::kNewTabButtonAssetWidth + kNewTabCaptionRestoredSpacing;
+      end_x += GetLayoutConstant(NEW_TAB_BUTTON_WIDTH) +
+          kNewTabCaptionRestoredSpacing;
     }
   }