Remove printDebugInfo from Unparser

lib/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.
 
 interface Visitor<R> {
   R visitBlock(Block node);
   R visitBreakStatement(BreakStatement node);
   R visitCascade(Cascade node);
   R visitCascadeReceiver(CascadeReceiver node);
   R visitCaseMatch(CaseMatch node);
@@ skipping 72 matching lines @@
   static int _HASH_COUNTER = 0;
 
   Node() : _hashCode = ++_HASH_COUNTER;
 
   hashCode() => _hashCode;
 
   abstract accept(Visitor visitor);
 
   abstract visitChildren(Visitor visitor);
 
-  toString() => unparse(false);
+  /**
+   * Returns this node unparsed to Dart source string.
+   */
+  toString() => unparse();
 
-  toDebugString() => unparse(true);
+  /**
+   * Returns Xml-like tree representation of this node.
+   */
+  toDebugString() {
+    return PrettyPrinter.prettyPrint(this);
+  }
 
   String getObjectDescription() => super.toString();
 
-  String unparse(bool printDebugInfo) {
-    Unparser unparser = new Unparser(printDebugInfo);
+  String unparse() {
+    Unparser unparser = new Unparser();
     try {
       return unparser.unparse(this);
     } catch (var e, var trace) {
       print(trace);
       return '<<unparse error: ${getObjectDescription()}: ${unparser.sb}>>';
     }
   }
 
   abstract Token getBeginToken();
 
@@ skipping 1590 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);
 }