All apps memory leak fix / unregister data observer

Bug: 197702957

Test: adb shell dumpsys meminfo com.google.android.apps.nexuslauncher, ahat

Change-Id: Ia5732cced959e4a199d9c2b59f1f3941a2e23552
Merged-In: Ia5732cced959e4a199d9c2b59f1f3941a2e23552
(cherry picked from commit 6e72c8bbba3ed580151d71aba9adbbd352fdb076)
2 files changed