Remove printDebugInfo from Unparser

lib/compiler/implementation/tree/nodes.dart

Index: lib/compiler/implementation/tree/nodes.dart
diff --git a/lib/compiler/implementation/tree/nodes.dart b/lib/compiler/implementation/tree/nodes.dart
index 039b69833d67f55b5fcf9ddb0a79a0c48405dd1e..c52b607b36d5c7ba8f3704a09a9c6e0517a42362 100644
--- a/lib/compiler/implementation/tree/nodes.dart
+++ b/lib/compiler/implementation/tree/nodes.dart
@@ -90,14 +90,22 @@ class Node implements Hashable {
 
   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) {