Revert "Browser: inkognito mode is not supported in 4.4"

This reverts commit 466eec10770c7278eb9a5750a48c165af8a19d47.

Change-Id: I8b9b8b8847b3b2540e6084abb75dd7e446cfceed
Merge "Revert "Browser: inkognito mode is not supported in 4.4"" into kitkat