Find: Another build fix for windows

Change-Id: I21e85b1536981bb55f0e1e5b46aed7a8a1e460c6
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>

src/plugins/find/searchresulttreeview.cpp

@@ -35,7 +35,8 @@
 #include <QHeaderView>
 #include <QKeyEvent>
 
-using namespace Find::Internal;
+namespace Find {
+namespace Internal {
 
 SearchResultTreeView::SearchResultTreeView(QWidget *parent)
     : QTreeView(parent)
@@ -103,3 +104,6 @@ SearchResultTreeModel *SearchResultTreeView::model() const
 {
     return m_model;
 }
+
+} // namespace Internal
+} // namespace Find