Compilation fix to wxWebView under wxOSX/Carbon after r71620.

wxWindow::m_peer is private, use GetPeer() to access it.

See #14352.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@71632 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/osx/webview_webkit.mm

@@ -694,7 +694,7 @@ void wxWebViewWebKit::OnSize(wxSizeEvent &event)
     // we want is the root view, because we need to make the y origin relative
     // to the very top of the window, not its contents, since we later flip
     // the y coordinate for Cocoa.
-    HIViewConvertRect (&rect, m_peer->GetControlRef(),
+    HIViewConvertRect (&rect, GetPeer()->GetControlRef(),
                                 HIViewGetRoot(
                                     (WindowRef) MacGetTopLevelWindowRef()
                                  ));