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desktop-pwas: For testing, use a server capable of serving HTTPS

Before this patch, tests were using the default EmbeddedTestServer,
which only served HTTP pages. Desktop PWAs can only be HTTPS so tests
should use HTTPS sites. Furthermore, Desktop PWAs will soon block
mixed content, so test pages need to be served over HTTPS.

Change-Id: I4af6850bdd851917fdeb2bf9d55fa62b6d3beff7
Reviewed-on: https://chromium-review.googlesource.com/926022
Commit-Queue: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Reviewed-by: Matt Giuca <mgiuca@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542074}