Revert "[1/n] OomAdjuster implementation correctness and efficiency overhaul"

This reverts commit 87ccf4197790b9ae5fc17353dafb12622cdec138.

Reason for revert: b/294181870

Bug: 294181870
Test: Treehugger
Change-Id: I40d38b76d77f5065c271f1a6bc0f909a5d4d56d5
11 files changed