Revert "DO NOT MERGE: Delete com.android.cronet from base_system. am: 86409603"

This reverts commit 14199b7a.

Reason for revert:
Rollback the stuff which has been removed
due to "remove cronet for R" to keep the intermediate branches
synced between {aosp, internal} master

Bug: 156368607
Change-Id: I95bcb80ccd330ce7f40a20912ab61c1ff9d15441
Merged-In: Ice9b733b22d45d6d6eaf8e3f3ed95b3ac50eefbb