[service-workers-tests] Fix cache-put.https.html to expect Response.text() to set body used. (#1782)

See step 3 of:

  https://fetch.spec.whatwg.org/#concept-body-consume-body

View on GitHub: https://github.com/w3c/web-platform-tests/pull/1782

Received on Monday, 27 April 2015 21:23:11 UTC