VCS: Do not hide virtual methods

Change-Id: I818eb8246f27b023e35155d50a8d08548660f709
Reviewed-on: http://codereview.qt.nokia.com/350
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Tobias Hunger <tobias.hunger@nokia.com>

src/plugins/subversion/subversionplugin.cpp

@@ -267,7 +267,7 @@ bool SubversionPlugin::initialize(const QStringList & /*arguments */, QString *e
     using namespace Core::Constants;
     using namespace ExtensionSystem;
 
-    VCSBase::VCSBasePlugin::initialize(new SubversionControl(this));
+    initializeVcs(new SubversionControl(this));
 
     m_subversionPluginInstance = this;
     Core::ICore *core = Core::ICore::instance();