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/memchecktool.cpp

@@ -467,6 +467,11 @@ IAnalyzerEngine *MemcheckTool::createEngine(const AnalyzerStartParameters &sp,
     return engine;
 }
 
+void MemcheckTool::startTool(StartMode mode)
+{
+    ValgrindPlugin::startValgrindTool(this, mode);
+}
+
 void MemcheckTool::engineStarting(const IAnalyzerEngine *engine)
 {
     clearErrorView();