Remove Enforcement in timer functions from spec

[vrana]

It calls HostEnsureCanCompileStrings which is covered below.

[koto]

That one is interesting. We cannot for now base the spec on HostEnsureCanCompileStrings, as that algorithm doesn't accept the object (usually; a string with the code) to be compiled - TC39#938, so we can't at that point make any decision whether to reject or accept.

We did solve it in setTimeout / setInterval spec-wise, as those are web platform features. Reusing HostEnsureCanCompileStrings does sound like a better place to hook the spec on, but it requires changes to EcmaScript. For now I decided to leave it as-is, given that the implementation matches (set(Timeout|Interval) are covered; eval is ignored).

[vrana]

I see. TT spec in String compilation writes HostEnsureCanCompileStrings but links EnsureCSPDoesNotBlockStringCompilation which confused me. I'll send another pull-request to fix it.

[vrana]

#118