Revert "Browser: disable incognito mode"

This reverts commit 5623a091605bf1d88687dc589a61ee6b54c554fe.

 This is the 2nd commit message:

Revert "Browser: fix pie crash"

This reverts commit 06929f1b1103f5a5651a8fc71e6b6e6b10bde71d.

Change-Id: I23f2e34ee125785bba8981f0611ba4986a9beaab