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

lib/src/polyfill.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 csslib.parser;
 
 /**
  * CSS polyfill emits CSS to be understood by older parsers that which do not
  * understand (var, calc, etc.).
  */
@@ skipping 34 matching lines @@
     }
   }
 
   void processVars(StyleSheet styleSheet) {
     // Build list of all var definitions.
     var mainStyleSheetVarDefs = (new _VarDefAndUsage(
         this._messages, _allVarDefinitions)..visitTree(styleSheet)).varDefs;
 
     // Resolve all definitions to a non-VarUsage (terminal expression).
     mainStyleSheetVarDefs.forEach((key, value) {
-      for (Expression expr in (value.expression as Expressions).expressions) {
+      for (var _ in (value.expression as Expressions).expressions) {
         mainStyleSheetVarDefs[key] =
             _findTerminalVarDefinition(_allVarDefinitions, value);
       }
     });
   }
 }
 
 /** Build list of all var definitions in all includes. */
 class _VarDefinitionsIncludes extends Visitor {
   final Map<String, VarDefinition> varDefs;
@@ skipping 181 matching lines @@
       }
     } else {
       // Return real CSS property.
       return varDef;
     }
   }
 
   // Didn't point to a var definition that existed.
   return varDef;
 }