Use classes in favor of structs

Change-Id: I6ad2df70b7ad9b5fdc5baddc3ef85d0fed0c139c
Reviewed-on: http://codereview.qt.nokia.com/2518
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Tobias Hunger <tobias.hunger@nokia.com>

src/plugins/git/commitdata.h

@@ -66,8 +66,9 @@ struct GitSubmitEditorPanelData
 
 QDebug operator<<(QDebug d, const GitSubmitEditorPanelData &);
 
-struct CommitData
+class CommitData
 {
+public:
     // A pair of state string/file name ('modified', 'file.cpp').
     typedef QPair<QString, QString> StateFilePair;