Move runtime js files down to lib/runtime/dart

test/codegen/expect/sunflower/sunflower.html

Index: test/codegen/expect/sunflower/sunflower.html
diff --git a/test/codegen/expect/sunflower/sunflower.html b/test/codegen/expect/sunflower/sunflower.html
index 62c60f7fade3742fcb09f8e31da54b72c04731f3..2b8589aaf422efd8f2fa3ac43d141d83951ea39f 100644
--- a/test/codegen/expect/sunflower/sunflower.html
+++ b/test/codegen/expect/sunflower/sunflower.html
@@ -26,13 +26,13 @@
     <script src="../dev_compiler/runtime/harmony_feature_check.js"></script>
 <script src="../dev_compiler/runtime/dart_utils.js"></script>
 <script src="../dev_compiler/runtime/dart_library.js"></script>
-<script src="../dev_compiler/runtime/_errors.js"></script>
-<script src="../dev_compiler/runtime/_generators.js"></script>
-<script src="../dev_compiler/runtime/_types.js"></script>
-<script src="../dev_compiler/runtime/_rtti.js"></script>
-<script src="../dev_compiler/runtime/_classes.js"></script>
-<script src="../dev_compiler/runtime/_operations.js"></script>
-<script src="../dev_compiler/runtime/dart_runtime.js"></script>
+<script src="../dev_compiler/runtime/dart/_errors.js"></script>
+<script src="../dev_compiler/runtime/dart/_generators.js"></script>
+<script src="../dev_compiler/runtime/dart/_types.js"></script>
+<script src="../dev_compiler/runtime/dart/_rtti.js"></script>
+<script src="../dev_compiler/runtime/dart/_classes.js"></script>
+<script src="../dev_compiler/runtime/dart/_operations.js"></script>
+<script src="../dev_compiler/runtime/dart/_runtime.js"></script>
 <script src="../dev_compiler/runtime/dart/core.js"></script>
 <script src="../dev_compiler/runtime/dart/collection.js"></script>
 <script src="../dev_compiler/runtime/dart/_internal.js"></script>