1. deprecate redundantly sounding wxArtProvider::FooProvider() to just Foo()

2. wxArtProvider::Remove() now really only removes the provider without
   deleting it, Delete() does delete it
3. moreover, ~wxArtProvider removes the provider as well so there is almost
   no need to call Delete() explicitly any more


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@41398 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/univ/themes/win32.cpp

@@ -1069,7 +1069,7 @@ wxWin32Theme::~wxWin32Theme()
 {
     delete m_renderer;
     delete m_scheme;
-    wxArtProvider::RemoveProvider(m_artProvider);
+    delete m_artProvider;
 }
 
 wxRenderer *wxWin32Theme::GetRenderer()