Change ui cursor identifiers to an enum class.

ash/drag_drop/drag_drop_controller.cc

Index: ash/drag_drop/drag_drop_controller.cc
diff --git a/ash/drag_drop/drag_drop_controller.cc b/ash/drag_drop/drag_drop_controller.cc
index 5a5643002f63f0516c092905dbb1d4e3f26a0be3..bfb243ebbad7bb456fc35bc124c509d29add5dda 100644
--- a/ash/drag_drop/drag_drop_controller.cc
+++ b/ash/drag_drop/drag_drop_controller.cc
@@ -436,13 +436,13 @@ void DragDropController::DragUpdate(aura::Window* target,
       e.set_root_location_f(event.root_location_f());
       e.set_flags(event.flags());
       op = delegate->OnDragUpdated(e);
-      gfx::NativeCursor cursor = ui::kCursorNoDrop;
+      gfx::NativeCursor cursor = ui::CursorType::NO_DROP;
       if (op & ui::DragDropTypes::DRAG_COPY)
-        cursor = ui::kCursorCopy;
+        cursor = ui::CursorType::COPY;
       else if (op & ui::DragDropTypes::DRAG_LINK)
-        cursor = ui::kCursorAlias;
+        cursor = ui::CursorType::ALIAS;
       else if (op & ui::DragDropTypes::DRAG_MOVE)
-        cursor = ui::kCursorGrabbing;
+        cursor = ui::CursorType::GRABBING;
       ash::Shell::Get()->cursor_manager()->SetCursor(cursor);
     }
   }
@@ -460,7 +460,7 @@ void DragDropController::DragUpdate(aura::Window* target,
 
 void DragDropController::Drop(aura::Window* target,
                               const ui::LocatedEvent& event) {
-  ash::Shell::Get()->cursor_manager()->SetCursor(ui::kCursorPointer);
+  ash::Shell::Get()->cursor_manager()->SetCursor(ui::CursorType::POINTER);
 
   // We must guarantee that a target gets a OnDragEntered before Drop. WebKit
   // depends on not getting a Drop without DragEnter. This behavior is
@@ -515,7 +515,7 @@ void DragDropController::AnimationEnded(const gfx::Animation* animation) {
 }
 
 void DragDropController::DoDragCancel(int drag_cancel_animation_duration_ms) {
-  ash::Shell::Get()->cursor_manager()->SetCursor(ui::kCursorPointer);
+  ash::Shell::Get()->cursor_manager()->SetCursor(ui::CursorType::POINTER);
 
   // |drag_window_| can be NULL if we have just started the drag and have not
   // received any DragUpdates, or, if the |drag_window_| gets destroyed during