Remove unused evented from ListContent #6171

Job	Run time
Test	2m 9s
Build extensions	1m 14s
ember-try (ember-lts-3.16)	1m 18s
ember-try (ember-lts-3.20)	1m 12s
ember-try (ember-lts-3.24)	1m 30s
ember-try (ember-lts-3.28)	1m 11s
ember-try (ember-lts-4.8)	1m 9s
ember-try (ember-lts-4.12)	1m 21s
ember-try (ember-release)	1m 22s
ember-try (ember-beta)	1m 29s
ember-try (ember-canary)	2m 2s
ember-try (ember-default-no-prototype-extensions)	1m 18s
Publish Firefox extension	0s
Publish Chrome extension	0s
Publish bookmarklet	0s
Publish npm package	0s
	17m 15s

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