Manifest for NDK Release 15 Beta 1 (3869609)

Change-Id: Iad74fd28d9477d3fa2a52c22fbf35ffd8712baaa
diff --git a/default.xml b/default.xml
index 7ecf7fa..056592b 100644
--- a/default.xml
+++ b/default.xml
@@ -4,7 +4,7 @@
   <remote  name="aosp"
            fetch=".."
            review="https://android-review.googlesource.com/" />
-  <default revision="ndk-r15-release"
+  <default revision="refs/tags/ndk-r15-beta1"
            remote="aosp"
            sync-j="4" />