Remove some dead code

The waitForScreens() function has not been used for a while,
so to avoid confusion around the different entry points to
event processing, we remove it.

Change-Id: I3a801492ab87b4835e0e1b3c9e264c29c1688c06
Reviewed-by: David Edmundson <davidedmundson@kde.org>

src/plugins/platforms/wayland/qwaylanddisplay.cpp

@@ -322,25 +322,6 @@ void QWaylandDisplay::handleScreenInitialized(QWaylandScreen *screen)
     }
 }
 
-void QWaylandDisplay::waitForScreens()
-{
-    flushRequests();
-
-    while (true) {
-        bool screensReady = !mScreens.isEmpty();
-
-        for (int ii = 0; screensReady && ii < mScreens.count(); ++ii) {
-            if (mScreens.at(ii)->geometry() == QRect(0, 0, 0, 0))
-                screensReady = false;
-        }
-
-        if (!screensReady)
-            blockingReadEvents();
-        else
-            return;
-    }
-}
-
 void QWaylandDisplay::registry_global(uint32_t id, const QString &interface, uint32_t version)
 {
     struct ::wl_registry *registry = object();

src/plugins/platforms/wayland/qwaylanddisplay_p.h

@@ -224,7 +224,6 @@ public slots:
     void flushRequests();
 
 private:
-    void waitForScreens();
     void checkError() const;
 
     void handleWaylandSync();