Revert "Move webview to /product"

This reverts commit c9b14af89f39430c8118ee0ee7b86fc8a71395b7.

Reason for revert: breaks products with artifact enforcements

Test: no
Change-Id: Ib567e770cef77a1cef8aee46c23519e1156e3aa6
diff --git a/CleanSpec.mk b/CleanSpec.mk
index 6e9f5aa..5464a64 100644
--- a/CleanSpec.mk
+++ b/CleanSpec.mk
@@ -47,6 +47,8 @@
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/lib64/libwebviewchromium.so)
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/app/webview)
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/app/webview)
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/product/app/webview)
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/product/app/webview)
 
 # ******************************************************************
 # NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST ABOVE THIS BANNER