Revert "[BR07.2] Redirect data saver switch to ConnectivityManager"

Revert submission 2745215-npmsbpf

DroidMonitor: Potential culprit for Bug 307256512 - verifying through ABTD before revert submission. This is part of the standard investigation process, and does not mean your CL will be reverted.


Reason for revert: 307256512

Reverted changes: /q/submissionid:2745215-npmsbpf

Change-Id: I0ad98a7b4798676d6cf1150ecc98c996627e18ee