Refactor wxTextEntry::AutoComplete() to simply call DoAutoCompleteXXX().

No real changes, just make the public AutoComplete() non-virtual and add
virtual DoAutoCompleteXXX() methods to make it easier to add new public
AutoComplete() overloads in the upcoming commits.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@67509 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/textentry.h

@@ -58,7 +58,7 @@ public:
 
         @see AutoCompleteFileNames()
     */
-    virtual bool AutoComplete(const wxArrayString& choices);
+    bool AutoComplete(const wxArrayString& choices);
 
     /**
         Call this function to enable auto-completion of the text typed in a
@@ -76,7 +76,7 @@ public:
 
         @see AutoComplete()
     */
-    virtual bool AutoCompleteFileNames();
+    bool AutoCompleteFileNames();
 
     /**
         Returns @true if the selection can be copied to the clipboard.