Enable some ServiceWorker layout tests
Enable some ServiceWorker layout tests

http/tests/serviceworker/registration.html
* was waiting on CR side to land

virtual/serviceworker/http/tests/serviceworker/registration.html
* was crashy but seems okay now (?)

virtual/serviceworker/http/tests/serviceworker/indexeddb.html
virtual/serviceworker/http/tests/serviceworker/postmessage.html
* were waiting on CR side to land

BUG=350103,352703,285976
TBR=alecflett

Review URL: https://codereview.chromium.org/210473003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@169890 bbb929c8-8fbe-4397-9dbb-9b2b20218538

primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs