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This is the last CL to remove NOTIFICATION_EXTENSIONS_READY_DEPRECATED.

Bug: 411566
Change-Id: I69937ae19ed42e259509ac0587d5285a33cb56b4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2199874Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Luke Halliwell (slow) <halliwell@chromium.org>
Commit-Queue: Ghazale Hosseinabadi <ghazale@chromium.org>
Cr-Commit-Position: refs/heads/master@{#769008}