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

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 96cd99e454694e5293fae0dfb824b4de9490b155..eee01a0b61e3cd5f4fd9af440092914a894de02c 100644
--- a/sdk/lib/web_sql/dart2js/web_sql_dart2js.dart
+++ b/sdk/lib/web_sql/dart2js/web_sql_dart2js.dart
@@ -354,14 +354,6 @@ class SqlResultSetRowList implements JavaScriptIndexingBehavior, List<Map> nativ
     throw new UnsupportedError("Cannot remove from immutable List.");
   }
 
-  void removeAll(Iterable elements) {
-    throw new UnsupportedError("Cannot remove from immutable List.");
-  }
-
-  void retainAll(Iterable elements) {
-    throw new UnsupportedError("Cannot remove from immutable List.");
-  }
-
   void removeWhere(bool test(Map element)) {
     throw new UnsupportedError("Cannot remove from immutable List.");
   }