Replace call to parseTypeVariablesOpt with computeTypeParam

Change-Id: Icc4443e9ba4206a3d16cdac5fdd3ffa70459012f
Reviewed-on: https://dart-review.googlesource.com/56043
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Commit-Queue: Dan Rubel <danrubel@google.com>
diff --git a/pkg/front_end/lib/src/fasta/parser/parser.dart b/pkg/front_end/lib/src/fasta/parser/parser.dart
index 87c29d8..e446df1 100644
--- a/pkg/front_end/lib/src/fasta/parser/parser.dart
+++ b/pkg/front_end/lib/src/fasta/parser/parser.dart
@@ -5078,7 +5078,8 @@
         listener.beginMetadataStar(start.next);
         listener.endMetadataStar(0);
       }
-      Token beforeFormals = parseTypeVariablesOpt(next);
+      Token beforeFormals =
+          computeTypeParamOrArg(next).parseVariables(next, this);
       listener.beginLocalFunctionDeclaration(start.next);
       token = typeInfo.parseType(beforeType, this);
       next = token.next;