Bump s-o-m to version 2.

TBR=ojan@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/657963002

git-svn-id: svn://svn.chromium.org/blink/trunk@183768 bbb929c8-8fbe-4397-9dbb-9b2b20218538