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* Remove references to how things worked before Xcode 9, which was released in 2017. * Remove references to the Chromium IRC channel, which was shut down in 2021. Direct people to Slack and the mailing lists instead. Change-Id: Iaf019ef8d38950f44690aced900c8b4aea7ffc63 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6565543 Reviewed-by: Sylvain Defresne <sdefresne@chromium.org> Commit-Queue: Sylvain Defresne <sdefresne@chromium.org> Auto-Submit: Raphael Kubo da Costa <kubo@igalia.com> Cr-Commit-Position: refs/heads/main@{#1462668}