[Application] Add the initialization for |header_|.
[Application] Add the initialization for |header_|.

This patch is to add the initialization for |header_| in the
constructor.

CID=194686

Related to XWALK-2928.

(cherry picked from commit b40940c6f1ca8125d37e2164795415f039413504)

TheDirtyCalvinist/spacewalk,TheDirtyCalvinist/spacewalk,TheDirtyCalvinist/spacewalk,TheDirtyCalvinist/spacewalk,TheDirtyCalvinist/spacewalk,TheDirtyCalvinist/spacewalk