Move CycleDirection enum into shelf_constants.

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 e7e541e7b22fb7037f3666558cc9b0734d1a99cf..1a7a8945e6a982dc469a5f9c270a4fb532220ffc 100644
--- a/ash/launcher/launcher_types.h
+++ b/ash/launcher/launcher_types.h
@@ -69,12 +69,6 @@ struct ASH_EXPORT LauncherItem {
 
 typedef std::vector<LauncherItem> LauncherItems;
 
-// The direction of the focus cycling.
-enum CycleDirection {
-  CYCLE_FORWARD,
-  CYCLE_BACKWARD
-};
-
 // LauncherItemDetails may be set on Window (by way of
 // SetShelfItemDetailsForWindow) to make the window appear in the shelf. See
 // ShelfWindowWatcher for details.