Implement getRange (returning an Iterable).

sdk/lib/web_sql/dart2js/web_sql_dart2js.dart

Index: sdk/lib/web_sql/dart2js/web_sql_dart2js.dart
diff --git a/sdk/lib/web_sql/dart2js/web_sql_dart2js.dart b/sdk/lib/web_sql/dart2js/web_sql_dart2js.dart
index ef559ed355482fd06c3fcfd0e39ad6f64b70311e..96cd99e454694e5293fae0dfb824b4de9490b155 100644
--- a/sdk/lib/web_sql/dart2js/web_sql_dart2js.dart
+++ b/sdk/lib/web_sql/dart2js/web_sql_dart2js.dart
@@ -382,14 +382,14 @@ class SqlResultSetRowList implements JavaScriptIndexingBehavior, List<Map> nativ
     throw new UnsupportedError("Cannot insertRange on immutable List.");
   }
 
+  Iterable<Map> getRange(int start, int end) =>
+    IterableMixinWorkaround.getRangeList(this, start, end);
+
   List<Map> sublist(int start, [int end]) {
     if (end == null) end = length;
     return Lists.getRange(this, start, end, <Map>[]);
   }
 
-  List<Map> getRange(int start, int rangeLength) =>
-      sublist(start, start + rangeLength);
-
   Map<int, Map> asMap() =>
     IterableMixinWorkaround.asMapList(this);