Move VM specific library files to the runtime/lib directory so they do

runtime/bin/utf_sources.gypi

Index: runtime/bin/utf_sources.gypi
diff --git a/runtime/bin/utf_sources.gypi b/runtime/bin/utf_sources.gypi
index f291807c9102d8ea6b455b32ec7f59991b3805dc..4698fcd86eaf751a8169c0586b63ff0f1e9c2ad8 100644
--- a/runtime/bin/utf_sources.gypi
+++ b/runtime/bin/utf_sources.gypi
@@ -3,13 +3,17 @@
 # BSD-style license that can be found in the LICENSE file.
 
 # This file contains all sources for the dart:utf library.
+#
+# TODO(ager): ../lib/utf/utf_vm.dart should be removed when the
+# VM can use the #source directive for libraries.  At that point
+# ../../lib/utf/utf.dart should be the only utf library file.
 {
   'sources': [
     # The utf_vm.dart file needs to be the first source file. It contains
     # the library and import directives for the dart:utf library. The
     # dart:utf library is created by concatenating the files listed here
     # in the order they are listed.
-    '../../lib/utf/utf_vm.dart',
+    '../lib/utf/utf_vm.dart',
 
     '../../lib/utf/utf_core.dart',
     '../../lib/utf/utf8.dart',