import support (removed @include)

lib/src/tree.dart

Index: lib/src/tree.dart
diff --git a/lib/src/tree.dart b/lib/src/tree.dart
index 16267431189c57e8448bacdede813143e15e1091..afeff9d133b40a639d0d971ed5dc706a703dd6b6 100644
--- a/lib/src/tree.dart
+++ b/lib/src/tree.dart
@@ -420,20 +420,6 @@ class FontFaceDirective extends Directive {
   visit(VisitorBase visitor) => visitor.visitFontFaceDirective(this);
 }
 
-class IncludeDirective extends Directive {
-  final String _include;
-  final StyleSheet _stylesheet;
-
-  IncludeDirective(this._include, this._stylesheet, Span span) : super(span);
-
-  visit(VisitorBase visitor) => visitor.visitIncludeDirective(this);
-
-  bool get isBuiltIn => false;
-  bool get isExtension => true;
-
-  StyleSheet get styleSheet => _stylesheet;
-}
-
 class StyletDirective extends Directive {
   final String _dartClassName;
   final List<RuleSet> _rulesets;