Initial gtk3 support

chrome/browser/ui/libgtk2ui/print_dialog_gtk2.h

Index: chrome/browser/ui/libgtk2ui/print_dialog_gtk2.h
diff --git a/chrome/browser/ui/libgtk2ui/print_dialog_gtk2.h b/chrome/browser/ui/libgtk2ui/print_dialog_gtk2.h
index ce39b5a22145a914042f3e15c92554aceb40243b..162e2f68516dff06325fa84c0275ea1799c75252 100644
--- a/chrome/browser/ui/libgtk2ui/print_dialog_gtk2.h
+++ b/chrome/browser/ui/libgtk2ui/print_dialog_gtk2.h
@@ -48,6 +48,9 @@ class PrintDialogGtk2
   void AddRefToDialog() override;
   void ReleaseDialog() override;
 
+  // Handles print job response.
+  void OnJobCompleted(GtkPrintJob* print_job, const GError* error);
+
  private:
   friend struct content::BrowserThread::DeleteOnThread<
       content::BrowserThread::UI>;
@@ -62,12 +65,6 @@ class PrintDialogGtk2
   // Prints document named |document_name|.
   void SendDocumentToPrinter(const base::string16& document_name);
 
-  // Handles print job response.
-  static void OnJobCompletedThunk(GtkPrintJob* print_job,
-                                  gpointer user_data,
-                                  GError* error);
-  void OnJobCompleted(GtkPrintJob* print_job, GError* error);
-
   // Helper function for initializing |context_|'s PrintSettings with a given
   // |settings|.
   void InitPrintSettings(printing::PrintSettings* settings);