Analyzer: Remove intermediate "ValgrindTool" inheritance level

It's an empty shell nowadays.

Change-Id: I661735eccf035b58cc405905a58bd74e787e6abc
Reviewed-by: Aurindam Jana <aurindam.jana@digia.com>

src/plugins/valgrind/memchecktool.cpp

@@ -179,7 +179,7 @@ static void initKindFilterAction(QAction *action, const QList<int> &kinds)
 }
 
 MemcheckTool::MemcheckTool(QObject *parent)
-  : ValgrindTool(parent)
+  : IAnalyzerTool(parent)
 {
     m_settings = 0;
     m_errorModel = 0;
@@ -286,6 +286,11 @@ RunMode MemcheckTool::runMode() const
     return MemcheckRunMode;
 }
 
+bool MemcheckTool::canRun(RunConfiguration *, RunMode mode) const
+{
+    return mode == MemcheckRunMode;
+}
+
 QString MemcheckTool::displayName() const
 {
     return tr("Valgrind Memory Analyzer");