Reland: Change input injection security model

This reverts commit 4df80f58c42d56facdc79ffa5bcba041300784e9.

Changes from revert: None

Bug: 207667844
Bug: 194952792
Test: TBD
Change-Id: I1bf9bd08fa9974ec54bbdddb27892afdda407331
Merged-In: I1bf9bd08fa9974ec54bbdddb27892afdda407331
9 files changed