QmlProject: Always use qmlobserver for debugging projects

Also only warn about missing qmlobserver when actually trying to
debug a .qmlproject.

Reviewed-by: Christiaan Janssen

src/plugins/debugger/debuggerengine.cpp

@@ -1053,35 +1053,6 @@ void DebuggerEngine::showQtDumperLibraryWarning(const QString &details)
     }
 }
 
-void DebuggerEngine::showQmlObserverToolWarning()
-{
-    QMessageBox dialog(plugin()->mainWindow());
-    QPushButton *qtPref = dialog.addButton(tr("Open Qt4 Options"),
-        QMessageBox::ActionRole);
-    QPushButton *helperOff = dialog.addButton(tr("Turn off QML Observer Usage"),
-        QMessageBox::ActionRole);
-    QPushButton *justContinue = dialog.addButton(tr("Continue Anyway"),
-        QMessageBox::AcceptRole);
-    dialog.setDefaultButton(justContinue);
-    dialog.setWindowTitle(tr("QML Observer Missing"));
-    dialog.setText(tr("QML Observer could not be found."));
-    dialog.setInformativeText(tr(
-        "QML Observer is used to offer additional debugging features for "
-        "QML applications, such as interactive debugging and inspection tools."
-        "It must be compiled for each used Qt version separately. "
-        "On the Qt4 options page, select a Qt installation "
-        "and click Rebuild."));
-    dialog.exec();
-    if (dialog.clickedButton() == qtPref) {
-        Core::ICore::instance()->showOptionsDialog(
-            _(Qt4ProjectManager::Constants::QT_SETTINGS_CATEGORY),
-            _(Qt4ProjectManager::Constants::QTVERSION_SETTINGS_PAGE_ID));
-    } else if (dialog.clickedButton() == helperOff) {
-        theDebuggerAction(UseQmlObserver)
-            ->setValue(qVariantFromValue(false), false);
-    }
-}
-
 QString DebuggerEngine::qtDumperLibraryName() const
 {
     if (theDebuggerAction(UseCustomDebuggingHelperLocation)->value().toBool())