Revert "[PiP2] Implement Content-PiP2"

This reverts commit 9a17f933696e397d1e9097c02414d8becccb0e44.

Reason for revert: b/420674781

Bug: 400459203
Change-Id: Ifeb589e58b7667a34b4fc3f7ea621db3fcdf13f1
16 files changed