Rename Launcher to Shelf.

ash/launcher/launcher_types.h

Index: ash/launcher/launcher_types.h
diff --git a/ash/launcher/launcher_types.h b/ash/launcher/launcher_types.h
index bbb1bbc41d7a3a1f4a7ba221a33c6c1c9f19b3af..9a8b16bf65ce7046122f1ff4e492658e05376165 100644
--- a/ash/launcher/launcher_types.h
+++ b/ash/launcher/launcher_types.h
@@ -91,7 +91,7 @@ enum CycleDirection {
 };
 
 // LauncherItemDetails may be set on Window (by way of
-// SetLauncherItemDetailsForWindow) to make the window appear in the shelf. See
+// SetShelfItemDetailsForWindow) to make the window appear in the shelf. See
 // ShelfWindowWatcher for details.
 struct ASH_EXPORT LauncherItemDetails {
   LauncherItemDetails();