Version 1.13.0-dev.7.6

Cherry pick e84f9941e1cf210646aef72e01eefaa993a7b798 to dev
Updated dartium_webkit_revision to 202694
diff --git a/tools/VERSION b/tools/VERSION
index 6051ec3..85daf0b 100644
--- a/tools/VERSION
+++ b/tools/VERSION
@@ -28,4 +28,4 @@
 MINOR 13
 PATCH 0
 PRERELEASE 7
-PRERELEASE_PATCH 5
+PRERELEASE_PATCH 6