Jin Dong 484087c181 Fix memory leak of DataSaverPreference
When DataSaverPreference is shown repeatedly, memory leak happens
since DataSaverBackend.Listener is not removed on onDetached().

TEST: Repeat enter and exit "Data usage" for
several times and check if the count of activity
is not increasing.

Bug: 72581115
Change-Id: Ic4a72de049bb87f1e522fe46dd0fb4bb58ed65a5
2018-01-29 16:32:45 +09:00
2015-04-13 09:21:39 -07:00
2017-11-20 16:39:59 -08:00
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3.1 GiB
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Java 89.8%
Kotlin 10.2%