These checks were disabled in Chromium due to historical reason.
Also fix compilation errors as a result of the above mentioned change.
Change-Id: I5d240f2f11aa5920598f954d696a15bdcbf78fd8
Extract encryption related handlings from Fragmenter and move into new
class EncrpytingFragmenter.
Change-Id: Id42493cd321fd7e306f8ce522c7ff04990965256