Re: [whatwg/fetch] Consider removing trailers API (#772)

A real-world use case and need for Trailer support and Server-Timing:
https://twitter.com/JJJ/status/1077988650602901505


tl;dr: we need trailers to emit timing and debug data about where time was spent as the page is being constructed, after the content is flushed. Forcing output buffering is both bad for user experience and performance, as well as causes random failures due to broken interleaving of flushes in real world applications like WordPress. If we had Trailers, we could collect the timing data and emit the header at the end — clean 'n simple.

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