Remove usage of global Ember variable #196

Job	Run time
lint (16.17.x)	1m 1s
test (16.17.x)	1m 14s
ember-try (16.17.x, ember-lts-3.28)	1m 56s
ember-try (16.17.x, ember-lts-3.24)	2m 5s
ember-try (16.17.x, ember-4.1)	2m 1s
ember-try (16.17.x, ember-release)	1m 54s
ember-try (16.17.x, ember-beta)	2m 0s
ember-try (16.17.x, ember-canary)	1m 59s
ember-try (16.17.x, ember-default-with-jquery)	2m 8s
ember-try (16.17.x, ember-classic)	2m 10s
ember-try (16.17.x, embroider-safe)	1m 43s
ember-try (16.17.x, embroider-optimized)	1m 48s
	21m 59s

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