Emilio Cobos Álvarez f46383f8bd Bug 1466656: Make ErrorReporter a smaller Rust type. r=heycam
And use the C++ ErrorReporter only to actually output errors.

ErrorReporter was so complicated because well, it was always enabled and had to
do a bunch of caching to not be (more) slow.

But since bug 1452143 it's disabled by default, so we can simplify this setup a
lot.

Also while at it make the error reporting pref a static pref so that we don't
mutate globals from CSS parsing unless we're actually reporting errors.

MozReview-Commit-ID: AuIyvJwt7AU
2018-06-05 11:09:39 +02:00
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