Update dart/tools/VERSION for change to Dartium DEPS..

Review URL: https://codereview.chromium.org//492443002

git-svn-id: http://dart.googlecode.com/svn/trunk@39374 260f80e4-7a28-3924-810f-c04153c831b5
diff --git a/tools/VERSION b/tools/VERSION
index 4ca5a22..442bdc3 100644
--- a/tools/VERSION
+++ b/tools/VERSION
@@ -28,4 +28,4 @@
 MINOR 6
 PATCH 0
 PRERELEASE 9
-PRERELEASE_PATCH 3
+PRERELEASE_PATCH 4