Revert "Parse new library syntax."

dart/lib/compiler/implementation/tree/nodes.dart

Index: dart/lib/compiler/implementation/tree/nodes.dart
diff --git a/dart/lib/compiler/implementation/tree/nodes.dart b/dart/lib/compiler/implementation/tree/nodes.dart
index ba1d775637ffa989269ed8217e268d188ebdf886..245025178c7cfef3577817f5880c7ca5c860a2c6 100644
--- a/dart/lib/compiler/implementation/tree/nodes.dart
+++ b/dart/lib/compiler/implementation/tree/nodes.dart
@@ -1593,130 +1593,6 @@ class ScriptTag extends Node {
   Token getBeginToken() => beginToken;
 
   Token getEndToken() => endToken;
-
-  LibraryTag toLibraryTag() {
-    if (isImport()) {
-      Identifier prefixNode;
-      if (prefix !== null) {
-        SourceString source = prefix.dartString.source;
-        Token token = new StringToken.fromSource(IDENTIFIER_INFO, source,
-                                                 prefix.token.charOffset);
-        token.next = prefix.token.next;
-        prefixNode = new Identifier(token);
-      }
-      return new Import(tag.token, argument, prefixNode, null);
-    } else if (isLibrary()) {
-      return new LibraryName(tag.token, argument);
-    } else if (isSource()) {
-      return new Part(tag.token, argument);
-    } else {
-      throw 'Unknown script tag ${tag.token.slowToString()}';
-    }
-  }
-}
-
-class LibraryTag extends Node {
-  bool get isLibraryName => false;
-  bool get isImport => false;
-  bool get isExport => false;
-  bool get isPart => false;
-}
-
-class LibraryName extends LibraryTag {
-  final Expression name;
-
-  final Token libraryKeyword;
-
-  LibraryName(this.libraryKeyword, this.name);
-
-  bool get isLibraryName => true;
-
-  LibraryName asLibraryName() => this;
-
-  accept(Visitor visitor) => visitor.visitLibraryName(this);
-
-  visitChildren(Visitor visitor) => name.accept(visitor);
-
-  Token getBeginToken() => libraryKeyword;
-
-  Token getEndToken() => name.getEndToken().next;
-}
-
-class Import extends LibraryTag {
-  final LiteralString uri;
-  final Identifier prefix;
-  final NodeList combinators;
-
-  final Token importKeyword;
-
-  Import(this.importKeyword, this.uri, this.prefix, this.combinators);
-
-  bool get isImport => true;
-
-  Import asImport() => this;
-
-  accept(Visitor visitor) => visitor.visitImport(this);
-
-  visitChildren(Visitor visitor) {
-    uri.accept(visitor);
-    if (prefix !== null) prefix.accept(visitor);
-    if (combinators !== null) combinators.accept(visitor);
-  }
-
-  Token getBeginToken() => importKeyword;
-
-  Token getEndToken() {
-    if (combinators !== null) return combinators.getEndToken().next;
-    if (prefix !== null) return prefix.getEndToken().next;
-    return uri.getEndToken().next;
-  }
-}
-
-class Export extends LibraryTag {
-  final LiteralString uri;
-  final NodeList combinators;
-
-  final Token exportKeyword;
-
-  Export(this.exportKeyword, this.uri, this.combinators);
-
-  bool get isExport => true;
-
-  Export asExport() => this;
-
-  accept(Visitor visitor) => visitor.visitExport(this);
-
-  visitChildren(Visitor visitor) {
-    uri.accept(visitor);
-    if (combinators !== null) combinators.accept(visitor);
-  }
-
-  Token getBeginToken() => exportKeyword;
-
-  Token getEndToken() {
-    if (combinators !== null) return combinators.getEndToken().next;
-    return uri.getEndToken().next;
-  }
-}
-
-class Part extends LibraryTag {
-  final LiteralString uri;
-
-  final Token partKeyword;
-
-  Part(this.partKeyword, this.uri);
-
-  bool get isPart => true;
-
-  Part asPart() => this;
-
-  accept(Visitor visitor) => visitor.visitPart(this);
-
-  visitChildren(Visitor visitor) => uri.accept(visitor);
-
-  Token getBeginToken() => partKeyword;
-
-  Token getEndToken() => uri.getEndToken().next;
 }
 
 class Typedef extends Node {