LeakExpectations: add more service worker tests

TBR=haraken
BUG=364377
NOTRY=true

Review URL: https://codereview.chromium.org/359963003

git-svn-id: svn://svn.chromium.org/blink/trunk@177181 bbb929c8-8fbe-4397-9dbb-9b2b20218538