Delete unreferenced type (#21343)

Had already deleted all the uses but didn't remove the type itself.

Author: acdlite

packages/react-reconciler/src/ReactFiberLane.new.js

@@ -11,25 +11,6 @@ import type {FiberRoot} from './ReactInternalTypes';
 
 // TODO: Ideally these types would be opaque but that doesn't work well with
 // our reconciler fork infra, since these leak into non-reconciler packages.
-export type LanePriority =
-  | 0
-  | 1
-  | 2
-  | 3
-  | 4
-  | 5
-  | 6
-  | 7
-  | 8
-  | 9
-  | 10
-  | 11
-  | 12
-  | 13
-  | 14
-  | 15
-  | 16
-  | 17;
 
 export type Lanes = number;
 export type Lane = number;

packages/react-reconciler/src/ReactFiberLane.old.js

@@ -11,25 +11,6 @@ import type {FiberRoot} from './ReactInternalTypes';
 
 // TODO: Ideally these types would be opaque but that doesn't work well with
 // our reconciler fork infra, since these leak into non-reconciler packages.
-export type LanePriority =
-  | 0
-  | 1
-  | 2
-  | 3
-  | 4
-  | 5
-  | 6
-  | 7
-  | 8
-  | 9
-  | 10
-  | 11
-  | 12
-  | 13
-  | 14
-  | 15
-  | 16
-  | 17;
 
 export type Lanes = number;
 export type Lane = number;