Version 1.9.0-dev.2.2

Apply patch from https://codereview.chromium.org/822613002

git-svn-id: http://dart.googlecode.com/svn/trunk@42546 260f80e4-7a28-3924-810f-c04153c831b5
diff --git a/tools/VERSION b/tools/VERSION
index 9da37e2..74eae8d 100644
--- a/tools/VERSION
+++ b/tools/VERSION
@@ -28,4 +28,4 @@
 MINOR 9
 PATCH 0
 PRERELEASE 2
-PRERELEASE_PATCH 1
+PRERELEASE_PATCH 2