Handle for-in loops

test/codegen/expect/server_mode/html_input.html

Index: test/codegen/expect/server_mode/html_input.html
diff --git a/test/codegen/expect/server_mode/html_input.html b/test/codegen/expect/server_mode/html_input.html
index 5af410206d7a846b0266f57e2e6df3e1f218b398..b799e112c301b187676dce8d9e6ec32debbd159c 100644
--- a/test/codegen/expect/server_mode/html_input.html
+++ b/test/codegen/expect/server_mode/html_input.html
@@ -2,7 +2,7 @@
 <script src="cached/c947f9f732203b97dd2882e63da78dbe/dev_compiler/runtime/harmony_feature_check.js"></script>
 <script src="cached/deb6a3373cd1da7c85173995799f2183/dev_compiler/runtime/dart_runtime.js"></script>
 <script src="cached/d1060bd213470131bd0fa7778ebf2c20/dev_compiler/runtime/dart/core.js"></script>
-<script src="cached/317811aadc67224cabbf500a7d95e18c/dev_compiler/runtime/dart/collection.js"></script>
+<script src="cached/814ee3adcc97fe46f873a89bcf9e62bd/dev_compiler/runtime/dart/collection.js"></script>
 <script src="cached/fa6f6e2fa00c90f05e1c0b6cedc964f2/dev_compiler/runtime/dart/math.js"></script>
 <script src="cached/c36af93826f645c97ae65b44badd998b/dev_compiler/runtime/messages_widget.js"></script>
 <link rel="stylesheet" href="cached/307a7ef1e0cd0544d55c6f768f5e3886/dev_compiler/runtime/messages.css">