Stop creating a synthetic node so that parent links will be preserved (issue 4833)

compiler/java/com/google/dart/compiler/ast/DartClass.java

Index: compiler/java/com/google/dart/compiler/ast/DartClass.java
===================================================================
--- compiler/java/com/google/dart/compiler/ast/DartClass.java	(revision 11616)
+++ compiler/java/com/google/dart/compiler/ast/DartClass.java	(working copy)
@@ -61,7 +61,7 @@
                    boolean isInterface,
                    Modifiers modifiers) {
     super(name);
-    this.nativeName = nativeName;
+    this.nativeName = becomeParentOf(nativeName);
     this.superclass = becomeParentOf(superclass);
     this.members.addAll(members);
     this.typeParameters.addAll(typeParameters);