Backed out changeset 38831e922852 (bug 1026314) for test_interfaces.html failures

--HG--
rename : dom/crypto/CryptoKey.cpp => dom/crypto/Key.cpp
rename : dom/crypto/CryptoKey.h => dom/crypto/Key.h
rename : dom/crypto/CryptoKeyPair.cpp => dom/crypto/KeyPair.cpp
rename : dom/crypto/CryptoKeyPair.h => dom/crypto/KeyPair.h