Manifest for Android Q Preview 4 (QPP4.190502.018)

Change-Id: I3cdd096d9243014560075c199d4b98a9f55fc70f
diff --git a/default.xml b/default.xml
index 44a7f5c..61cb0ae 100644
--- a/default.xml
+++ b/default.xml
@@ -4,7 +4,7 @@
   <remote  name="aosp"
            fetch=".."
            review="https://android-review.googlesource.com/" />
-  <default revision="refs/tags/android-q-preview-2.5"
+  <default revision="refs/tags/android-q-preview-4"
            remote="aosp"
            sync-j="4" />