remove deprecated noOfDocks of corona

app/dockcorona.cpp

@@ -655,17 +655,6 @@ void DockCorona::aboutApplication()
     aboutDialog->show();
 }
 
-int DockCorona::noOfDocks()
-{
-    QHash<const Plasma::Containment *, DockView *> *views = m_layoutManager->currentDockViews();
-
-    if (views) {
-        return views->count();
-    } else {
-        return 0;
-    }
-}
-
 QList<Plasma::Types::Location> DockCorona::freeEdges(QScreen *screen) const
 {
     using Plasma::Types;

app/dockcorona.h

@@ -134,7 +134,6 @@ private:
     bool appletExists(uint containmentId, uint appletId) const;
     bool containmentExists(uint id) const;
 
-    int noOfDocks();
     int primaryScreenId() const;
 
     QStringList containmentsIds();

app/dockview.cpp

@@ -1082,9 +1082,7 @@ int DockView::totalDocksCount() const
 
 int DockView::docksWithTasks()
 {
-    auto dockCorona = qobject_cast<DockCorona *>(corona());
-
-    if (!dockCorona || !m_managedLayout)
+    if (!m_managedLayout)
         return 0;
 
     return m_managedLayout->noDocksWithTasks();