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The ErrorConsole has been launched for several milestones. Remove the
corresponding feature switch.

Bug: None
Change-Id: I403d6dedb51227433a75b99cc6de244eaf06d851
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2131360Reviewed-by: David Bertoni <dbertoni@chromium.org>
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#755457}