Cleanup change in r44998 a bit

sdk/lib/io/http_parser.dart

 // Copyright (c) 2013, 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.
 
 part of dart.io;
 
 // Global constants.
 class _Const {
   // Bytes for "HTTP".
   static const HTTP = const [72, 84, 84, 80];
@@ skipping 601 matching lines @@
             }
           }
           _state = _State.HEADER_START;
           break;
 
         case _State.HEADER_START:
           _headers = new _HttpHeaders(version);
           if (byte == _CharCode.CR) {
             _state = _State.HEADER_ENDING;
           } else if (byte == _CharCode.LF) {
-            if (_headersEnd()) {
-              return;
-            } else {
-              break;
-            }
+            _state = _State.HEADER_ENDING;
+            _index--;  // Make the new state see the LF again.
           } else {
             // Start of new header field.
             _headerField.add(_toLowerCaseByte(byte));
             _state = _State.HEADER_FIELD;
           }
           break;
 
         case _State.HEADER_FIELD:
           if (byte == _CharCode.COLON) {
             _state = _State.HEADER_VALUE_START;
@@ skipping 53 matching lines @@
               }
             } else {
               _headers._add(headerField, headerValue);
             }
             _headerField.clear();
             _headerValue.clear();
 
             if (byte == _CharCode.CR) {
               _state = _State.HEADER_ENDING;
             } else if (byte == _CharCode.LF) {
-              if (_headersEnd()) {
-                return;
-              } else {
-                break;
-              }
+              _state = _State.HEADER_ENDING;
+              _index--;  // Make the new state see the LF again.
             } else {
               // Start of new header field.
               _headerField.add(_toLowerCaseByte(byte));
               _state = _State.HEADER_FIELD;
             }
           }
           break;
 
         case _State.HEADER_ENDING:
           _expect(byte, _CharCode.LF);
@@ skipping 353 matching lines @@
     }
   }
 
   void _reportError(error, [stackTrace]) {
     if (_socketSubscription != null) _socketSubscription.cancel();
     _state = _State.FAILURE;
     _controller.addError(error, stackTrace);
     _controller.close();
   }
 }