libwebm/webm_parser/src/master_parser.h cannot use std::hash argument_type
<rdar://96912027>
Pull request: https://github.com/WebKit/WebKit/pull/4541
Committed 254695@main (35b48db2b452): <https://commits.webkit.org/254695@main> Reviewed commits have been landed. Closing PR #4541 and removing active labels.