Version 1.6.0

Fixup deps files and VERSION file on 1.6 branch

R=whesse@google.com

Review URL: https://codereview.chromium.org//504133002

git-svn-id: http://dart.googlecode.com/svn/branches/1.6@39553 260f80e4-7a28-3924-810f-c04153c831b5
diff --git a/tools/VERSION b/tools/VERSION
index 870331c..e0d9f59 100644
--- a/tools/VERSION
+++ b/tools/VERSION
@@ -23,9 +23,9 @@
 #  * Making cherry-picks to stable channel
 #     - increase PATCH by 1
 #
-CHANNEL dev
+CHANNEL stable
 MAJOR 1
 MINOR 6
 PATCH 0
-PRERELEASE 9
-PRERELEASE_PATCH 7
+PRERELEASE 0
+PRERELEASE_PATCH 0