chaps: fixup Linux build for new SecureBlob API

Commit 89f59bbe5df changed the interface for the SecureBlob class
and updated most of the Chaps code, but some of the Linux-specific
code was missed.

TEST=Chaps unit tests

Change-Id: Ib52743408caabc8a4e7c8dcf153073d22b286095
Reviewed-by: Alex Vakulenko <>
Tested-by: David Drysdale <>
Trybot-Ready: David Drysdale <>
Commit-Queue: Darren Krahn <>
2 files changed