remove deprecated resolve2

Internal references have been migrated.

Change-Id: I7db908c69127fea58f213a057b873b7b52a5e1f4
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/350641
Reviewed-by: Konstantin Shcheglov <scheglov@google.com>
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Commit-Queue: Phil Quitslund <pquitslund@google.com>

pkg/analyzer/lib/src/dart/micro/resolve_file.dart

@@ -553,15 +553,6 @@ class FileResolver {
     });
   }
 
-  // TODO(pq): remove after cider extensions are updated.
-  @Deprecated("Use 'resolve' instead.")
-  Future<ResolvedUnitResult> resolve2({
-    required String path,
-    OperationPerformanceImpl? performance,
-  }) async {
-    return resolve(path: path, performance: performance);
-  }
-
   /// The [completionLine] and [completionColumn] are zero based.
   Future<ResolvedForCompletionResultImpl> resolveForCompletion({
     required int completionLine,