Macros: Clean up singleton APIs

Task-number: QTCREATORBUG-9763

Change-Id: I76c4d60279f738272b0cf5fda651ce266f798c2c
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>

src/plugins/macros/macrosplugin.cpp

@@ -59,6 +59,7 @@ MacrosPlugin::MacrosPlugin()
 
 MacrosPlugin::~MacrosPlugin()
 {
+    delete m_macroManager;
 }
 
 bool MacrosPlugin::initialize(const QStringList &arguments, QString *errorMessage)