Inline pluginview widget code

No need to have a single treeview in a .ui file, and one step
closer to make it searchable.

Change-Id: I3aa27ac695ea3c55000473ae56e8c5b0330c1adf
Reviewed-by: Eike Ziller <eike.ziller@digia.com>

src/libs/extensionsystem/pluginview.h

@@ -37,6 +37,7 @@
 #include <QIcon>
 
 QT_BEGIN_NAMESPACE
+class QTreeWidget;
 class QTreeWidgetItem;
 QT_END_NAMESPACE
 
@@ -46,12 +47,6 @@ class PluginManager;
 class PluginSpec;
 class PluginCollection;
 
-namespace Internal {
-namespace Ui {
-    class PluginView;
-} // namespace Ui
-} // namespace Internal
-
 class EXTENSIONSYSTEM_EXPORT PluginView : public QWidget
 {
     Q_OBJECT
@@ -79,7 +74,7 @@ private:
     void updatePluginDependencies();
     int parsePluginSpecs(QTreeWidgetItem *parentItem, Qt::CheckState &groupState, QList<PluginSpec*> plugins);
 
-    Internal::Ui::PluginView *m_ui;
+    QTreeWidget *m_categoryWidget;
     QList<QTreeWidgetItem*> m_items;
     QHash<PluginSpec*, QTreeWidgetItem*> m_specToItem;