Class MediaDescriptorHelper doesn't need virtual destructor.

Change-Id: I6711ef712a8a04d6fc8991f7056d1440964832ef
Reviewed-on: https://gerrit.libreoffice.org/1220Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>
Tested-by: Markus Mohrhard <markus.mohrhard@googlemail.com>

chart2/source/inc/MediaDescriptorHelper.hxx

@@ -50,7 +50,6 @@ private:
 public:
     MediaDescriptorHelper( const ::com::sun::star::uno::Sequence<
                             ::com::sun::star::beans::PropertyValue > & rMediaDescriptor );
-    virtual ~MediaDescriptorHelper();
 
     ::com::sun::star::uno::Sequence<
                 ::com::sun::star::beans::PropertyValue > getReducedForModel();

chart2/source/tools/MediaDescriptorHelper.cxx

@@ -196,11 +196,6 @@ void MediaDescriptorHelper::impl_init()
 
     ISSET_Storage = sal_False;
     ISSET_Stream = sal_False;
-}
-
-MediaDescriptorHelper::~MediaDescriptorHelper()
-{
-
 }
 
     uno::Sequence< beans::PropertyValue > MediaDescriptorHelper