Implement getRange (returning an Iterable).

sdk/lib/web_sql/dartium/web_sql_dartium.dart

Index: sdk/lib/web_sql/dartium/web_sql_dartium.dart
diff --git a/sdk/lib/web_sql/dartium/web_sql_dartium.dart b/sdk/lib/web_sql/dartium/web_sql_dartium.dart
index 87b3c18ebf82780f7e5239c3cb63bbc8c0fd5654..d8ea2738bfd33820812afc257cd1b65c554fc056 100644
--- a/sdk/lib/web_sql/dartium/web_sql_dartium.dart
+++ b/sdk/lib/web_sql/dartium/web_sql_dartium.dart
@@ -400,14 +400,14 @@ class SqlResultSetRowList extends NativeFieldWrapperClass1 implements List<Map>
     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);