Fix the prototype of the callback passed to gtk_enumerate_printers().

chrome/browser/printing/print_dialog_gtk.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/printing/print_dialog_gtk.h"
 
 #include <fcntl.h>
 #include <gtk/gtkunixprint.h>
 #include <sys/stat.h>
 #include <sys/types.h>
@@ skipping 22 matching lines @@
 // CUPS Duplex attribute and values.
 const char kCUPSDuplex[] = "cups-Duplex";
 const char kDuplexNone[] = "None";
 const char kDuplexTumble[] = "DuplexTumble";
 const char kDuplexNoTumble[] = "DuplexNoTumble";
 
 // Helper class to track GTK printers.
 class GtkPrinterList {
  public:
   GtkPrinterList() : default_printer_(NULL) {
-    gtk_enumerate_printers((GtkPrinterFunc)SetPrinter, this, NULL, TRUE);
+    gtk_enumerate_printers(SetPrinter, this, NULL, TRUE);
   }
 
   ~GtkPrinterList() {
     for (std::vector<GtkPrinter*>::iterator it = printers_.begin();
          it < printers_.end(); ++it) {
       g_object_unref(*it);
     }
   }
 
   // Can return NULL if there's no default printer. E.g. Printer on a laptop
@@ skipping 14 matching lines @@
       if (strcmp(name, gtk_printer_get_name(*it)) == 0) {
         return *it;
       }
     }
 
     return NULL;
   }
 
  private:
   // Callback function used by gtk_enumerate_printers() to get all printer.
-  static bool SetPrinter(GtkPrinter* printer, GtkPrinterList* printer_list) {
+  static gboolean SetPrinter(GtkPrinter* printer, gpointer data) {
+    GtkPrinterList *printer_list = (GtkPrinterList*)data;
     if (gtk_printer_is_default(printer))
       printer_list->default_printer_ = printer;
 
     g_object_ref(printer);
     printer_list->printers_.push_back(printer);
 
-    return false;
+    return FALSE;
   }
 
   std::vector<GtkPrinter*> printers_;
   GtkPrinter* default_printer_;
 };
 
 }  // namespace
 
 // static
 printing::PrintDialogGtkInterface* PrintDialogGtk::CreatePrintDialog(
@@ skipping 323 matching lines @@
   // Printing finished. Matches AddRef() in PrintDocument();
   Release();
 }
 
 void PrintDialogGtk::InitPrintSettings(const PageRanges& page_ranges,
                                        PrintSettings* settings) {
   printing::PrintSettingsInitializerGtk::InitPrintSettings(
       gtk_settings_, page_setup_, page_ranges, false, settings);
   context_->InitWithSettings(*settings);
 }