Manifest for Android 8.0.0 Release 51 (6780349)

Change-Id: I6855833f3c33377c18cc8b80a0c92db10de30178
diff --git a/default.xml b/default.xml
index 5bd7121..5c473b5 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-8.0.0_r50"
+  <default revision="refs/tags/android-8.0.0_r51"
            remote="aosp"
            sync-j="4" />