Update display::Display::kInvalidDisplayID constant.

ash/display/unified_mouse_warp_controller.cc

Index: ash/display/unified_mouse_warp_controller.cc
diff --git a/ash/display/unified_mouse_warp_controller.cc b/ash/display/unified_mouse_warp_controller.cc
index 228360cfd9146c1b0d82ae714f463fd91492367a..613c0e5b1778a6dd3a7af82e703b5a6c2b971a6c 100644
--- a/ash/display/unified_mouse_warp_controller.cc
+++ b/ash/display/unified_mouse_warp_controller.cc
@@ -56,7 +56,7 @@ aura::WindowTreeHost* FindMirroringWindowTreeHostFromScreenPoint(
 }  // namespace
 
 UnifiedMouseWarpController::UnifiedMouseWarpController()
-    : current_cursor_display_id_(display::Display::kInvalidDisplayID),
+    : current_cursor_display_id_(display::kInvalidDisplayId),
       update_location_for_test_(false) {}
 
 UnifiedMouseWarpController::~UnifiedMouseWarpController() {}
@@ -74,7 +74,7 @@ bool UnifiedMouseWarpController::WarpMouseCursor(ui::MouseEvent* event) {
   // transform back to the host coordinates.
   target->GetHost()->GetRootTransform().TransformPoint(&point_in_unified_host);
 
-  if (current_cursor_display_id_ != display::Display::kInvalidDisplayID) {
+  if (current_cursor_display_id_ != display::kInvalidDisplayId) {
     aura::client::CursorClient* cursor_client =
         aura::client::GetCursorClient(target->GetRootWindow());
     if (cursor_client) {
@@ -88,7 +88,7 @@ bool UnifiedMouseWarpController::WarpMouseCursor(ui::MouseEvent* event) {
         const display::Display& new_display = mirroring_display_list[index];
         if (current_cursor_display_id_ != new_display.id()) {
           cursor_client->SetDisplay(new_display);
-          current_cursor_display_id_ = display::Display::kInvalidDisplayID;
+          current_cursor_display_id_ = display::kInvalidDisplayId;
         }
       }
     }