Remove unnecessary wxStaticBitmap::DeleteCurrentHandleIfNeeded()

This function was used exactly once and it's simpler and more clear to
just inline it into Free() where it was called.

No real changes, this is just a small simplification.

include/wx/msw/statbmp.h

@@ -90,9 +90,6 @@ private:
     // HICON (which can be 0) and destroy the previous image if necessary.
     void MSWReplaceImageHandle(WXLPARAM handle);
 
-    // Delete the current handle only if we own it.
-    void DeleteCurrentHandleIfNeeded();
-
 
     wxDECLARE_DYNAMIC_CLASS(wxStaticBitmap);
     wxDECLARE_EVENT_TABLE();

src/msw/statbmp.cpp

@@ -191,20 +191,15 @@ void wxStaticBitmap::Init()
     m_ownsCurrentHandle = false;
 }
 
-void wxStaticBitmap::DeleteCurrentHandleIfNeeded()
+void wxStaticBitmap::Free()
 {
+    MSWReplaceImageHandle(0);
+
     if ( m_ownsCurrentHandle )
     {
         ::DeleteObject(m_currentHandle);
         m_ownsCurrentHandle = false;
     }
-}
-
-void wxStaticBitmap::Free()
-{
-    MSWReplaceImageHandle(0);
-
-    DeleteCurrentHandleIfNeeded();
 
     wxDELETE(m_image);
 }