Revert "[ActivityManager] Fix race condition in pss collection"

This reverts commit 876704207fec6bbcd40b6ec9436eeb1cd7e77c03.
Revert "lowmemorykiller: Overwrite LMK parameters for low-tier devices"

This reverts commit 718602622ec71c04f784a01bbee30cfa692ff0e2.
Revert "[ActivityManager] Finish the failed-to-pause activity"

This reverts commit 6ad8448779a75a5057a256c53691ac21ba22577c.
Revert "ActivityManager: support new free memory estimate"

This reverts commit 44588c162c16bde44a95f5655407d6d4904fa28d.
Revert "[View] Clear Hardware-Layers before system destroys HardwareRenderer​."

This reverts commit f06f688b4a7649cc4decbde9e6ff70dcb6f284af.
Revert "[ActivityManager] Prevent coredump file may not complete for testing."

This reverts commit 448e1ebbe6d2234aa721a1afb6830bd42d2f776f.
Revert "Ensure to add Persistent Apps to LruProcess List on app restart"

This reverts commit 031b7e99ab341ae1f610149ff2be2280c89606aa.
Revert "ActivityManagerService: Fix heavy games kill during incoming call"

This reverts commit a763beba17981e1c10429c0d4353f1e51e2b6b43.
Revert "ActivityManagerService: Penalise large apps going to background"

This reverts commit 897f0fbf26793acb43859fcc0f8981b9b907edd6.
Revert "[ActivityManager] Prevent provider creating twice."

This reverts commit 260eb923670da6cc08470493be64cfc42307eb0e.
partial revert HEADsup fix
Do not show Pie Search button by default