Move RunScriptInternal() out of wxWebViewIE and rename

There is no need for this function to be a class member.

include/wx/msw/webview_ie.h

@@ -200,9 +200,6 @@ private:
     //Toggles control features see INTERNETFEATURELIST for values.
     bool EnableControlFeature(long flag, bool enable = true);
 
-    bool RunScriptInternal(wxVariant varJavascript,
-        wxAutomationObject* scriptAO, wxVariant* varResult);
-
     wxDECLARE_DYNAMIC_CLASS(wxWebViewIE);
 };