clearkey default: parsePssh securely

Bug: 137282168
Bug: 137370379
Test: drmpoc
Change-Id: Ic20a99b6b9fc661ead769217f88960571b5f68ad
Merged-In: Ic20a99b6b9fc661ead769217f88960571b5f68ad
(cherry picked from commit 1531cddad7c603fb530d1109463a1e8c03d515ff)
1 file changed