Automatic: whirlwind-release - Updating to a new version number from 6812.20.0

Change-Id: I6ee36f185de91a90f42ac70735eeb304e9075410
diff --git a/chromeos/config/chromeos_version.sh b/chromeos/config/chromeos_version.sh
index f0e4c56..0621937 100755
--- a/chromeos/config/chromeos_version.sh
+++ b/chromeos/config/chromeos_version.sh
@@ -20,7 +20,7 @@
   # Release Branch number.
   # Increment by 1 for every release build on a branch.
   # Reset to 0 when increasing release build number.
-  export CHROMEOS_BRANCH=20
+  export CHROMEOS_BRANCH=21
 
   # Patch number.
   # Increment by 1 in case a non-scheduled branch release build is necessary.