Don't create a Plasma::Theme in units which is unused

Unit now takes all fonts from the default system font, which we monitor
for with an eventFilter on the application object.

Change-Id: Ib17c01e2811c0c672be18a930d625d84ecd154a4

src/declarativeimports/core/units.cpp

@@ -50,7 +50,6 @@ Units::Units(QObject *parent)
     updateSpacing(); // updates gridUnit and *Spacing properties
 
     connect(KIconLoader::global(), &KIconLoader::iconLoaderSettingsChanged, this, &Units::iconLoaderSettingsChanged);
-    connect(&m_theme, &Plasma::Theme::themeChanged, this, &Units::updateSpacing);
     QCoreApplication::instance()->installEventFilter(this);
 
     const QString configFile = QStandardPaths::writableLocation(QStandardPaths::GenericConfigLocation) + QLatin1Char('/') + plasmarc;

src/declarativeimports/core/units.h

@@ -175,8 +175,6 @@ private:
      */
     int devicePixelIconSize(const int size) const;
 
-    Plasma::Theme m_theme;
-
     int m_gridUnit;
     qreal m_devicePixelRatio;
     qreal m_dpi;