Chaohui Wang 6ef678f19d Add some null annotation for data usage code
Also do some clean up.

Bug: 296357959
Test: manual - on DataUsageList page
Change-Id: Id7548e1d58d946810c844b9559bb00d65306f441
2023-08-28 17:47:06 +08:00
2022-04-14 09:55:36 +00:00
2019-11-25 20:28:35 +09:00
2022-10-06 09:10:38 -07:00
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3.1 GiB
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Kotlin 10.2%