Revert "Update all Angular libs (run update_all.sh)."

third_party/pkg/angular/lib/core/parser/tokens.dart

-part of angular.core.parser.lexer;
-
-class Token {
-  static const Token EOF = const Token._(-1);
-  final int index;
-  const Token._(this.index);
-
-  bool get isIdentifier => false;
-  bool get isString => false;
-  bool get isNumber => false;
-
-  bool isCharacter(int code) => false;
-  bool isOperator(String operator) => false;
-
-  bool get isKeyword => false;
-  bool get isKeywordNull => false;
-  bool get isKeywordUndefined => false;
-  bool get isKeywordTrue => false;
-  bool get isKeywordFalse => false;
-
-  num toNumber() => null;
-}
-
-class CharacterToken extends Token {
-  final int _code;
-  CharacterToken(int index, this._code) : super._(index);
-  bool isCharacter(int code) => _code == code;
-  String toString() => new String.fromCharCode(_code);
-}
-
-class IdentifierToken extends Token {
-  final String _text;
-  final bool _isKeyword;
-  IdentifierToken(int index, this._text, this._isKeyword) : super._(index);
-  bool get isIdentifier => !_isKeyword;
-  bool get isKeyword => _isKeyword;
-  bool get isKeywordNull => _isKeyword && _text == "null";
-  bool get isKeywordUndefined => _isKeyword && _text == "undefined";
-  bool get isKeywordTrue => _isKeyword && _text == "true";
-  bool get isKeywordFalse => _isKeyword && _text == "false";
-  String toString() => _text;
-}
-
-class OperatorToken extends Token {
-  final String _text;
-  OperatorToken(int index, this._text) : super._(index);
-  bool isOperator(String operator) => _text == operator;
-  String toString() => _text;
-}
-
-class NumberToken extends Token {
-  final num _value;
-  NumberToken(int index, this._value) : super._(index);
-  bool get isNumber => true;
-  num toNumber() => _value;
-  String toString() => "$_value";
-}
-
-class StringToken extends Token {
-  final String input;
-  final String _value;
-  StringToken(int index, this.input, this._value) : super._(index);
-  bool get isString => true;
-  String toString() => _value;
-}