PluginsEnabled exist for QWebEngineSettings ?

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Hi all, i'm actually doing an app, i've QT 5.4.0 and i need to use flash in a Chromium browser.

My main.cpp :
@#include <QApplication>
#include <QQmlApplicationEngine>
#include <QtWebEngine/QtWebEngine>
#include <QtWebEngineDepends>
#include <QtWebEngineWidgets/QtWebEngineWidgets>
#include <QtWebEngineWidgets/QWebEngineSettings>
#include <QtWebEngineDepends>

int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QtWebEngine::initialize();
engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
return app.exec();
}@

I tried to add :
@QWebEngineSettings *defaultSettings = QWebEngineSettings::globalSettings();
defaultSettings->setAttribute(QWebEngineSettings::JavascriptEnabled, true);
defaultSettings->setAttribute(QWebEngineSettings::PluginsEnabled, true);@
and
@QWebEngineSettings::globalSettings()->setAttribute(QWebEngineSettings::PluginsEnabled, true);@

But i've the error :
"no member named 'PluginsEnabled' in 'QWebEngineSettings'"

I try since 5 days ago and i didn't found how to enable flash in QtWebEngine.

Can u help me please ?

PS : I'm french sorry for my bas english