add guards to a couple more `window` accesses in socket.ts (#10620) #21034

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Authenticated end-to-end tests (1)	2m 56s
End-to-end tests (1)	2m 43s
End-to-end tests (2)	2m 47s
End-to-end tests (3)	3m 16s
End-to-end tests (4)	3m 10s
End-to-end tests (5)	2m 56s
End-to-end tests (6)	2m 49s
End-to-end tests (7)	3m 8s
End-to-end tests (8)	3m 6s
End-to-end tests (9)	3m 27s
End-to-end tests (10)	3m 6s
	39m 37s

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