Add closeBraceTokenFor and use it instead of BeginToken.

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

 // Copyright (c) 2015, 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.element_listener;
 
 import 'package:front_end/src/fasta/fasta_codes.dart' show Message;
 
 import 'package:front_end/src/fasta/fasta_codes.dart' as codes;
 
@@ skipping 17 matching lines @@
 import '../string_validator.dart' show StringValidator;
 import 'package:front_end/src/fasta/scanner.dart'
     show ErrorToken, StringToken, Token;
 import 'package:front_end/src/fasta/scanner.dart' as Tokens show EOF_TOKEN;
 import '../tree/tree.dart';
 import '../util/util.dart' show Link, LinkBuilder;
 import 'package:front_end/src/fasta/parser.dart'
     show Listener, ParserError, optional;
 import 'package:front_end/src/fasta/parser/identifier_context.dart'
     show IdentifierContext;
-import 'package:front_end/src/scanner/token.dart'
-    show BeginToken, KeywordToken, TokenType;
+import 'package:front_end/src/scanner/token.dart' show KeywordToken, TokenType;
 import 'partial_elements.dart'
     show
         PartialClassElement,
         PartialElement,
         PartialFieldList,
         PartialFunctionElement,
         PartialMetadataAnnotation,
         PartialTypedefElement;
 
 const bool VERBOSE = false;
@@ skipping 429 matching lines @@
   }
 
   @override
   void endFunctionType(Token functionToken, Token endToken) {
     popNode(); // Return type.
     popNode(); // Type parameters.
     pushNode(null);
   }
 
   @override
-  void handleParenthesizedExpression(BeginToken token) {
+  void handleParenthesizedExpression(Token token) {
     Expression expression = popNode();
     pushNode(new ParenthesizedExpression(expression, token));
   }
 
   @override
   void handleModifier(Token token) {
     pushNode(new Identifier(token));
   }
 
   @override
@@ skipping 444 matching lines @@
       memberErrors = memberErrors.tail.prepend(true);
     }
     reporter.reportErrorMessage(spannable, errorCode, arguments);
   }
 
   void reportErrorFromToken(Token token, MessageKind errorCode,
       [Map arguments = const {}]) {
     reportError(reporter.spanFromToken(token), errorCode, arguments);
   }
 }