Code clean-up, mostly constructors

pkg/analyzer/lib/src/generated/scanner.dart

 // Copyright (c) 2014, 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 engine.scanner;
 
 import 'dart:collection';
 
 import 'error.dart';
 import 'java_engine.dart';
@@ skipping 1992 matching lines @@
   Token previous;
 
   /**
    * The next token in the token stream.
    */
   Token _next;
 
   /**
    * Initialize a newly created token to have the given [type] and [offset].
    */
-  Token(this.type, int offset) {
-    this.offset = offset;
-  }
+  Token(this.type, this.offset);
 
   /**
    * Return the offset from the beginning of the file to the character after the
    * last character of the token.
    */
   int get end => offset + length;
 
   /**
    * Return `true` if this token represents an operator.
    */
@@ skipping 638 matching lines @@
   CommentToken get precedingComments => _precedingComment;
 
   void set precedingComments(CommentToken comment) {
     _precedingComment = comment;
     _setCommentParent(_precedingComment);
   }
 
   @override
   Token copy() => new TokenWithComment(type, offset, precedingComments);
 }