Per previous discussions  highlighted in spec issues, we'd like to remove DOMError from the platform in favor of using DOMException.
Sanity check: web-compat allowing, should we just swap DOMException in any place DOMError is currently used? I've done this (among other unvetted things) in the Indexed DB "v2" ED , which exposes `error` attributes, which would now be DOMExceptions. A Blink CL  passes our tests which only inspected name/message properties. No idea yet if this is web compatible, but it seems likely other than some test code. Any IDL concerns about DOMException attributes? Are there expectations that specs would have e.g. subclasses or typedefs of DOMException? I assume no and no, but maybe others had a different vision?  https://www.w3.org/Bugs/Public/show_bug.cgi?id=23367  https://www.w3.org/Bugs/Public/show_bug.cgi?id=21740  https://github.com/w3c/IndexedDB/issues/16  https://github.com/w3c/IndexedDB/commit/42fb5845b9974b95bb0c2c446f893863ec83da2f  https://codereview.chromium.org/1182233003/