Crash when calling WEBGL_lose_context.loseContext() after the context has been lost
<rdar://85765536>
Created attachment 452724 [details] Patch
Created attachment 452830 [details] Patch
Committed r290356 (247674@main): <https://commits.webkit.org/247674@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 452830 [details].