Remove Collection, Collections and clean up List/Set/Queue implementations of retain/remove.

editor/util/plugins/com.google.dart.java2dart/resources/ast_include.dart

Index: editor/util/plugins/com.google.dart.java2dart/resources/ast_include.dart
diff --git a/editor/util/plugins/com.google.dart.java2dart/resources/ast_include.dart b/editor/util/plugins/com.google.dart.java2dart/resources/ast_include.dart
index dddee7aedf2fcc5dba34ce8832abb627315d2b9c..6242aa877de02fff88dc9d47193a2727e5f6b83f 100644
--- a/editor/util/plugins/com.google.dart.java2dart/resources/ast_include.dart
+++ b/editor/util/plugins/com.google.dart.java2dart/resources/ast_include.dart
@@ -29,7 +29,7 @@ class NodeList<E extends ASTNode> extends ListWrapper<E> {
     owner.becomeParentOf(node);
     elements.add(node);
   }
-  bool addAll(Collection<E> nodes) {
+  bool addAll(Iterable<E> nodes) {
     if (nodes != null) {
       for (E node in nodes) {
         add(node);
@@ -65,4 +65,4 @@ class NodeList<E extends ASTNode> extends ListWrapper<E> {
   ASTNode getOwner() {
     return owner;
   }
-}
+}