Bug 1021607 - Introduce BasicSymmetricKeyAlgorithm
Bug 1021607 - Implement import key operation for PBKDF2 r=bz,rbarnes
Bug 1021607 - Implement derive bits operation for PBKDF2
Revert "Bug 1021607 - Implement derive bits operation for PBKDF2"

This reverts commit 40fd09165b4ad01b3a9308eb21589714e3fd9b36.