Use NodeList where possible.

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

Index: compiler/java/com/google/dart/compiler/ast/DartStringInterpolation.java
diff --git a/compiler/java/com/google/dart/compiler/ast/DartStringInterpolation.java b/compiler/java/com/google/dart/compiler/ast/DartStringInterpolation.java
index 2cc7a8586882b8b2eec3dabc37100bbfb0043df1..143f156699cc64d88c5a6abea04021a86a652583 100644
--- a/compiler/java/com/google/dart/compiler/ast/DartStringInterpolation.java
+++ b/compiler/java/com/google/dart/compiler/ast/DartStringInterpolation.java
@@ -20,18 +20,18 @@ public class DartStringInterpolation extends DartLiteral {
    * adjacent expressions (e.g. $"${a} ${b}${c}" is represented by 4 strings
    * ("", " ", "", "") and 3 expressions (#(){a}, #(){b}, #(){c}).
    */
-  private List<DartStringLiteral> strings;
+  private final NodeList<DartStringLiteral> strings = NodeList.create(this);;
 
   /** Embedded expressions (see {@link strings} for details). */
-  private List<DartExpression> expressions;
+  private final NodeList<DartExpression> expressions = NodeList.create(this);
 
   public DartStringInterpolation(List<DartStringLiteral> strings,
       List<DartExpression> expressions) {
     Preconditions.checkNotNull(strings);
     Preconditions.checkNotNull(expressions);
     Preconditions.checkArgument(strings.size() == expressions.size() + 1);
-    this.strings = becomeParentOf(strings);
-    this.expressions = becomeParentOf(expressions);
+    this.strings.addAll(strings);
+    this.expressions.addAll(expressions);
   }
 
   public List<DartStringLiteral> getStrings() {
@@ -44,8 +44,8 @@ public class DartStringInterpolation extends DartLiteral {
 
   @Override
   public void visitChildren(ASTVisitor<?> visitor) {
-    visitor.visit(strings);
-    visitor.visit(expressions);
+    strings.accept(visitor);
+    expressions.accept(visitor);
   }
 
   @Override