pkg/csslib: Remove a number of unused members, prepare for release

lib/src/tokenizer_base.dart

Index: lib/src/tokenizer_base.dart
diff --git a/lib/src/tokenizer_base.dart b/lib/src/tokenizer_base.dart
index 7999a8f8603ce1d71e7aace88f9f28f260ea0a33..8c52fb0bad37eafbe1aa28aa066907e9a04b93be 100644
--- a/lib/src/tokenizer_base.dart
+++ b/lib/src/tokenizer_base.dart
@@ -55,9 +55,6 @@ abstract class TokenizerBase {
   int _index = 0;
   int _startIndex = 0;
 
-  static const String _CDATA_START = '<![CDATA[';
-  static const String _CDATA_END = ']]>';
-
   TokenizerBase(this._file, this._text, this._skipWhitespace,
       [this._index = 0]);
 
@@ -104,14 +101,6 @@ abstract class TokenizerBase {
     }
   }
 
-  String _tokenText() {
-    if (_index < _text.length) {
-      return _text.substring(_startIndex, _index);
-    } else {
-      return _text.substring(_startIndex, _text.length);
-    }
-  }
-
   Token _finishToken(int kind) {
     return new Token(kind, _file.span(_startIndex, _index));
   }
@@ -306,14 +295,6 @@ abstract class TokenizerBase {
     }
   }
 
-  Token _finishOpenBrace() {
-    return _finishToken(TokenKind.LBRACE);
-  }
-
-  Token _finishCloseBrace() {
-    return _finishToken(TokenKind.RBRACE);
-  }
-
   Token finishString(int quote) {
     if (_maybeEatChar(quote)) {
       if (_maybeEatChar(quote)) {