Remove unused API.

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

 // Copyright (c) 2012, 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 tree;
 
 abstract class Visitor<R> {
   const Visitor();
 
   R visitNode(Node node);
@@ skipping 579 matching lines @@
   final Token ifToken;
   final Token elseToken;
 
   If(this.condition, this.thenPart, this.elsePart,
      this.ifToken, this.elseToken);
 
   If asIf() => this;
 
   bool get hasElsePart => elsePart != null;
 
-  void validate() {
-    // TODO(ahe): Check that condition has size one.
-  }
-
   accept(Visitor visitor) => visitor.visitIf(this);
 
   visitChildren(Visitor visitor) {
     if (condition != null) condition.accept(visitor);
     if (thenPart != null) thenPart.accept(visitor);
     if (elsePart != null) elsePart.accept(visitor);
   }
 
   Token getBeginToken() => ifToken;
 
@@ skipping 297 matching lines @@
   /** Non-null on validated string literals. */
   final DartString dartString;
 
   LiteralString(this.token, this.dartString);
 
   LiteralString asLiteralString() => this;
 
   void visitChildren(Visitor visitor) {}
 
   bool get isInterpolation => false;
-  bool isValidated() => dartString != null;
 
   Token getBeginToken() => token;
   Token getEndToken() => token;
 
   accept(Visitor visitor) => visitor.visitLiteralString(this);
 }
 
 class LiteralNull extends Literal<String> {
   LiteralNull(Token token) : super(token, null);
 
@@ skipping 786 matching lines @@
   visitChildren(Visitor visitor) {
     labels.accept(visitor);
     statement.accept(visitor);
   }
 
   Token getBeginToken() => labels.getBeginToken();
 
   Token getEndToken() => statement.getEndToken();
 
   bool isValidContinueTarget() => statement.isValidContinueTarget();
-
-  Node getBody() => statement;
 }
 
 abstract class LibraryTag extends Node {
   final Link<MetadataAnnotation> metadata;
 
   LibraryTag(this.metadata);
 
   bool get isLibraryName => false;
   bool get isImport => false;
   bool get isExport => false;
@@ skipping 350 matching lines @@
  * argument).
  *
  * TODO(ahe): This method is controversial, the team needs to discuss
  * if top-level methods are acceptable and what naming conventions to
  * use.
  */
 initializerDo(Node node, f(Node node)) {
   SendSet send = node.asSendSet();
   if (send != null) return f(send.arguments.head);
 }