MediaMetrics: Make Item final

 *

 * The Item is designed for the service as it has getters.

 */

class Item : public mediametrics::BaseItem {

class Item final : public mediametrics::BaseItem {

public:

    class Prop {

        : mKey(key) { }

    Item() = default;

    // We enable default copy and move constructors and make this class final

    // to prevent a derived class; this avoids possible data slicing.

    Item(const Item& other) = default;

    Item(Item&& other) = default;

    Item& operator=(const Item& other) = default;

    Item& operator=(Item&& other) = default;

    bool operator==(const Item& other) const {

        if (mPid != other.mPid

            || mUid != other.mUid

        return prop;

    }

    // Changes to member variables below require changes to clear().

    pid_t         mPid = -1;

    uid_t         mUid = -1;

    std::string   mPkgName;