Re: [xhr] Abandon hope of removing sync XHR from the web platform? (#20)

@annevk this is the console warning in Blink with by far the highest usage, around 2%:
https://www.chromestatus.com/metrics/feature/timeline/popularity/581

There's trade-off here, between training web developers to ignore console warnings because they happen too often and for things that aren't actually going to break, and nudging people away from sync XHR even if it will never be removed. 1% would be better than 2%, after all.

What the spec says on the topic (quoted above) goes too far, I think. I don't think sync XHR is "in the process of being removed from the web platform" and no browser will be able to throw `InvalidAccessError` any time soon. If it were made a bit more tentative like "sync XHR on the main thread is bad for the user experience, browsers please show console warnings and developers please stop using it, if usage is eventually low enough maybe we'll remove it" that would be better.

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