Manifest for Android 8.1.0 Release 27 (OPM4.171019.016.A1)

Change-Id: I2b6c1b0aa0203653c3bfdf09fc44f3ec403f7cb5

default.xml

@@ -4,7 +4,7 @@
   <remote  name="aosp"
            fetch=".."
            review="https://android-review.googlesource.com/" />
-  <default revision="refs/tags/android-8.1.0_r26"
+  <default revision="refs/tags/android-8.1.0_r27"
            remote="aosp"
            sync-j="4" />