Cleanup and fixes to some dart:io files

runtime/bin/http_parser.dart

 // Copyright (c) 2012, 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.
 
 // Global constants.
 class _Const {
   // Bytes for "HTTP".
   static const HTTP = const [72, 84, 84, 80];
   // Bytes for "HTTP/1.".
   static const HTTP1DOT = const [72, 84, 84, 80, 47, 49, 46];
@@ skipping 515 matching lines @@
                 _reset();
               } else {
                 _state = _State.CHUNK_SIZE_STARTING_CR;
               }
             }
 
             // Hack - as we always do index++ below.
             index--;
             break;
 
-          case _state = _State.FAILURE:
+          case _State.FAILURE:
             // Should be unreachable.
             assert(false);
             break;
 
           default:
             // Should be unreachable.
             assert(false);
             break;
         }
 
         // Move to the next byte.
         index++;
       }
     } catch (e) {
       // Report the error through the error callback if any. Otherwise
       // throw the error.
       if (error != null) {
         error(e);
         _state = _State.FAILURE;
       } else {
         throw e;
       }
     }
 
     // Return the number of bytes parsed.
     return index - offset;
   }
 
-  int connectionClosed() {
+  void connectionClosed() {
     if (_state < _State.FIRST_BODY_STATE) {
       _state = _State.FAILURE;
       // Report the error through the error callback if any. Otherwise
       // throw the error.
       var e = new HttpParserException(
           "Connection closed before full header was received");
       if (error != null) {
         error(e);
         return;
       }
@@ skipping 16 matching lines @@
         return;
       }
       throw e;
     }
   }
 
   String get version {
     switch (_httpVersion) {
       case _HttpVersion.HTTP10:
         return "1.0";
-        break;
       case _HttpVersion.HTTP11:
         return "1.1";
-        break;
     }
     return null;
   }
 
   int get messageType => _messageType;
   int get contentLength => _contentLength;
   bool get upgrade => _connectionUpgrade && _state == _State.UPGRADED;
   bool get persistentConnection => _persistentConnection;
 
   void set responseToMethod(String method) { _responseToMethod = method; }
@@ skipping 101 matching lines @@
   Function dataEnd;
   Function error;
 }
 
 
 class HttpParserException implements Exception {
   const HttpParserException([String this.message = ""]);
   String toString() => "HttpParserException: $message";
   final String message;
 }