Use OpenSSL RAND_bytes for random IV generation
Use OpenSSL RAND_bytes for random IV generation

base::RandBytes may not be cryptographically strong.

Bug: 13658504
Change-Id: Id5dcd4e512f05c2f06302654277f2fd11a53f2b7

leandromoreira/edash-packager,leandromoreira/edash-packager,nevil/edash-packager,leandromoreira/edash-packager,nevil/edash-packager,leandromoreira/edash-packager,nevil/edash-packager,leandromoreira/edash-packager