Reverts the following two commits:

pkg/compiler/lib/src/parser/partial_parser.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library dart2js.parser.partial;
 
 import '../common.dart';
 import '../tokens/token.dart' show BeginGroupToken, ErrorToken, Token;
 import '../tokens/token_constants.dart' as Tokens show EOF_TOKEN;
 import '../util/characters.dart' as Characters show $CLOSE_CURLY_BRACKET;
@@ skipping 138 matching lines @@
         token = parseRedirectingFactoryBody(token);
         expectSemicolon(token);
       } else {
         token = skipBlock(token);
       }
       listener.skippedFunctionBody(token);
     }
     return token;
   }
 
-  Token parseFormalParameters(Token token, {bool inFunctionType: false})
-      => skipFormals(token);
+  Token parseFormalParameters(Token token) => skipFormals(token);
 
   Token skipFormals(Token token) {
     listener.beginOptionalFormalParameters(token);
     if (!optional('(', token)) {
       if (optional(';', token)) {
         listener.recoverableError(token, "expected '('");
         return token;
       }
       return listener.unexpected(token);
     }
     BeginGroupToken beginGroupToken = token;
     Token endToken = beginGroupToken.endGroup;
     listener.endFormalParameters(0, token, endToken);
     return endToken.next;
   }
 }