Unreviewed, rebaseline service workers flaky tests.

Unreviewed, rebaseline service workers flaky tests.

LayoutTests/imported/w3c:

* web-platform-tests/service-workers/service-worker/fetch-canvas-tainting-cache.https-expected.txt:
* web-platform-tests/service-workers/service-worker/fetch-canvas-tainting.https-expected.txt:
* web-platform-tests/service-workers/service-worker/fetch-cors-xhr.https-expected.txt:
* web-platform-tests/service-workers/service-worker/fetch-request-redirect.https-expected.txt:
* web-platform-tests/service-workers/service-worker/unregister-controller.https-expected.txt:
* web-platform-tests/service-workers/service-worker/update-bytecheck.https-expected.txt:

LayoutTests:

* TestExpectations:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@226125 268f45cc-cd09-0410-ab3c-d52691b4dbfc