Revert "Throttle requests to ActivityManager.getProcessMemoryInfo()."

This reverts commit 1f3b0302fda5cbbe0d5683cc057c84aaa1b8925c.

Reason for revert: broke SDK builds.  See ab/4976218

Change-Id: Id532e20eed8e13735a09cca5affc92005b685744
6 files changed