Revert "analyzer: move convenience factory back to base plugin"

This reverts commit 06a41da04e.

Change-Id: I06a41da04e726ffd35da18d99cd2f46cb99467bf
Reviewed-on: http://codereview.qt.nokia.com/1094
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: hjk <qthjk@ovi.com>

src/plugins/valgrind/valgrindplugin.h

@@ -51,6 +51,7 @@ public:
     virtual bool initialize(const QStringList &arguments, QString *errorString);
     virtual void extensionsInitialized() {}
 
+    static void startValgrindTool(Analyzer::IAnalyzerTool *tool, Analyzer::StartMode mode);
 };
 
 } // namespace Internal