Remove qplatformdrag.h dependency in qguiapplication_p.h

Including a qpa/ header here doesn't really work very well
for other modules using qguiapplication_p.h.

Change-Id: I7620b40bc4731d5a74fe11537637f376c578a786
Reviewed-by: Girish Ramakrishnan <girish.1.ramakrishnan@nokia.com>

src/gui/kernel/qguiapplication.cpp

@@ -50,6 +50,7 @@
 #include <qpa/qplatformnativeinterface.h>
 #include <qpa/qplatformtheme.h>
 #include <qpa/qplatformintegration.h>
+#include <qpa/qplatformdrag.h>
 
 #include <QtCore/QAbstractEventDispatcher>
 #include <QtCore/QVariant>

src/gui/kernel/qguiapplication_p.h

@@ -53,14 +53,13 @@
 #include "private/qwindowsysteminterface_qpa_p.h"
 #include "private/qshortcutmap_p.h"
 
-#include <qpa/qplatformdrag.h>
-
 QT_BEGIN_HEADER
 
 QT_BEGIN_NAMESPACE
 
 class QPlatformIntegration;
 class QPlatformTheme;
+class QPlatformDragQtResponse;
 struct QDrawHelperGammaTables;
 
 class Q_GUI_EXPORT QGuiApplicationPrivate : public QCoreApplicationPrivate

src/widgets/itemviews/qitemdelegate.cpp

@@ -45,6 +45,7 @@
 #include <qabstractitemmodel.h>
 #include <qapplication.h>
 #include <qpa/qplatformintegration.h>
+#include <qpa/qplatformdrag.h>
 #include <private/qguiapplication_p.h>
 #include <qbrush.h>
 #include <qlineedit.h>

src/widgets/itemviews/qstyleditemdelegate.cpp

@@ -45,6 +45,7 @@
 #include <qabstractitemmodel.h>
 #include <qapplication.h>
 #include <qpa/qplatformintegration.h>
+#include <qpa/qplatformdrag.h>
 #include <private/qguiapplication_p.h>
 #include <qbrush.h>
 #include <qlineedit.h>