Merge "Fix RefBase Explicit destruction"

#include <openssl/aes.h>

#include <utils/KeyedVector.h>

#include <utils/Mutex.h>

#include <utils/RefBase.h>

namespace android {

struct ABuffer;

namespace clearkeycas {

class KeyFetcher;

class ClearKeyCasSession : public RefBase {

class ClearKeyCasSession {

public:

    explicit ClearKeyCasSession(CasPlugin *plugin);