[w3c/ServiceWorker] Add WPT for an in-scope iframe inside a data URL iframe. (#1393)

Add WPT for this case.

From https://bugs.chromium.org/p/chromium/issues/detail?id=899334#c14:
Given that data URL is now an opaque origin [1], the origin's not potentially trustworthy (per "Is origin potentially trustworthy?" algorithm in [2]), and therefore it's not secure [3], and a framed document in a non-secure context is not a secure context either [4].

[1] https://github.com/web-platform-tests/wpt/pull/3663
[2] https://www.w3.org/TR/secure-contexts/#is-origin-trustworthy
[3] https://www.w3.org/TR/secure-contexts/#examples-framed
[4] https://www.w3.org/TR/secure-contexts/#settings-object

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