Clean up OContainerListenerAdapter

* elide OContainerListenerAdapter_BASE
* no need for protected members

Change-Id: I70095dadc4b1f42f04c8ea76b2236bf99a226da9
diff --git a/compilerplugins/clang/mergeclasses.results b/compilerplugins/clang/mergeclasses.results
index 6d50c21..42bbffd 100644
--- a/compilerplugins/clang/mergeclasses.results
+++ b/compilerplugins/clang/mergeclasses.results
@@ -216,7 +216,6 @@ merge comphelper::NameContainerImpl with comphelper::NameContainer
merge comphelper::OAccessibleContextHelper with comphelper::OCommonAccessibleComponent
merge comphelper::OAnyEnumeration_BASE with comphelper::OAnyEnumeration
merge comphelper::OComponentProxyAggregation with comphelper::OAccessibleWrapper
merge comphelper::OContainerListenerAdapter_BASE with comphelper::OContainerListenerAdapter
merge comphelper::OProxyAggregation with comphelper::OComponentProxyAggregationHelper
merge comphelper::OSeekableInputWrapper_BASE with comphelper::OSeekableInputWrapper
merge comphelper::PropertySetInfo_BASE with comphelper::PropertySetInfo
diff --git a/include/comphelper/containermultiplexer.hxx b/include/comphelper/containermultiplexer.hxx
index cfc76a3..fda66f0 100644
--- a/include/comphelper/containermultiplexer.hxx
+++ b/include/comphelper/containermultiplexer.hxx
@@ -67,17 +67,12 @@ namespace comphelper
        void setAdapter(OContainerListenerAdapter* _pAdapter);
    };


    //= OContainerListenerAdapter
    class SAL_DLLPUBLIC_TEMPLATE OContainerListenerAdapter_BASE
        : public cppu::WeakImplHelper<css::container::XContainerListener> {};

    class COMPHELPER_DLLPUBLIC OContainerListenerAdapter
        : public OContainerListenerAdapter_BASE
        : public cppu::WeakImplHelper<css::container::XContainerListener>
    {
        friend class OContainerListener;

    protected:
    private:
        css::uno::Reference< css::container::XContainer >
                                m_xContainer;
        OContainerListener*     m_pListener;