Change ui cursor identifiers to an enum class.

ui/wm/core/cursor_manager.cc

Index: ui/wm/core/cursor_manager.cc
diff --git a/ui/wm/core/cursor_manager.cc b/ui/wm/core/cursor_manager.cc
index 1c3c6c99a12d50629540067e965465ead39962d7..3284abc4523aff2a82111bf52c70875336c6ea74 100644
--- a/ui/wm/core/cursor_manager.cc
+++ b/ui/wm/core/cursor_manager.cc
@@ -22,12 +22,11 @@ namespace internal {
 class CursorState {
  public:
   CursorState()
-      : cursor_(ui::kCursorNone),
+      : cursor_(ui::CursorType::NONE),
         visible_(true),
         cursor_set_(ui::CURSOR_SET_NORMAL),
         mouse_events_enabled_(true),
-        visible_on_mouse_events_enabled_(true) {
-  }
+        visible_on_mouse_events_enabled_(true) {}
 
   gfx::NativeCursor cursor() const { return cursor_; }
   void set_cursor(gfx::NativeCursor cursor) { cursor_ = cursor; }