Change getRange to sublist. Make getRange deprecated.

tools/dom/templates/html/impl/impl_Node.darttemplate

Index: tools/dom/templates/html/impl/impl_Node.darttemplate
diff --git a/tools/dom/templates/html/impl/impl_Node.darttemplate b/tools/dom/templates/html/impl/impl_Node.darttemplate
index ad6c2db606631fed1e92e30c1182017ce2cab760..8f091cc460d3d8c943822ad5de59a35f8935040a 100644
--- a/tools/dom/templates/html/impl/impl_Node.darttemplate
+++ b/tools/dom/templates/html/impl/impl_Node.darttemplate
@@ -244,8 +244,13 @@ $endif
     throw new UnsupportedError(
         "Cannot insertRange on immutable List.");
   }
+  List<Node> sublist(int start, [int end]) {
+    if (end == null) end == length;
+    return Lists.getRange(this, start, end, <Node>[]);
+  }
+
   List<Node> getRange(int start, int rangeLength) =>
-      Lists.getRange(this, start, rangeLength, <Node>[]);
+      sublist(start, start + rangeLength);
 
   // -- end List<Node> mixins.