service worker: Remove update.html test that is already in WPT

WPT's update-https.html is identical to update.html.

Bug: 450507, 688116
Change-Id: I4bc56eb465f23bfba34c256dccb2c3874ecb6d04
Reviewed-on: https://chromium-review.googlesource.com/754201
Reviewed-by: Marijn Kruisselbrink <mek@chromium.org>
Commit-Queue: Matt Falkenhagen <falken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#513921}
3 files changed