merge 601d39b688bcbb1789e145d1b72753206c24d374

Change-Id: I9795ab63b29481de392a8672d272082270894e1f
diff --git a/CleanSpec.mk b/CleanSpec.mk
index 9582513..3f8344f 100644
--- a/CleanSpec.mk
+++ b/CleanSpec.mk
@@ -1,4 +1,4 @@
-# Copyright (C) 2007 The Android Open Source Project
+
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -217,6 +217,9 @@
 # 4.4.2
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/build.prop)
 
+# Make libart the default runtime
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/build.prop)
+
 # ************************************************
 # NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST
 # ************************************************