Add more owners to Source/modules/serviceworker (blink)

Adding falken and dominicc.

BUG=n/a
NOTRY=true

Review URL: https://codereview.chromium.org/290333011

git-svn-id: svn://svn.chromium.org/blink/trunk@174581 bbb929c8-8fbe-4397-9dbb-9b2b20218538