Merge "Remove the lock/unlock workaround from CameraService" into kraken

status_t CameraService::Client::checkPid() const {

    int callingPid = getCallingPid();

    if (callingPid == mClientPid) return NO_ERROR;

    if (callingPid == getpid()) {

        LOGW("FIXME: use camera from mediaserver without permission.");

        return NO_ERROR;

    }

    LOGW("attempt to use a locked camera from a different process"

         " (old pid %d, new pid %d)", mClientPid, callingPid);

    return EBUSY;