Remove obsolete chromeos specific code

chrome/browser/ui/gtk/gtk_util.h

Index: chrome/browser/ui/gtk/gtk_util.h
diff --git a/chrome/browser/ui/gtk/gtk_util.h b/chrome/browser/ui/gtk/gtk_util.h
index da114709ac2469d1b9652e4201fddeabffc4d457..feb55043f8760bc851168a54420e44344d0cc471 100644
--- a/chrome/browser/ui/gtk/gtk_util.h
+++ b/chrome/browser/ui/gtk/gtk_util.h
@@ -293,14 +293,9 @@ void ShowDialogWithMinLocalizedWidth(GtkWidget* dialog,
                                      int width_id);
 
 // Wrapper to present a window. On Linux, it just calls gtk_window_present or
-// gtk_window_present_with_time for non-zero timestamp. For ChromeOS, it first
-// finds the host window of the dialog contents and then present it.
+// gtk_window_present_with_time for non-zero timestamp.
 void PresentWindow(GtkWidget* window, int timestamp);
 
-// Get real window for given dialog. On ChromeOS, this gives the native dialog
-// host window. On Linux, it merely returns the passed in dialog.
-GtkWindow* GetDialogWindow(GtkWidget* dialog);
-
 // Gets dialog window bounds.
 gfx::Rect GetDialogBounds(GtkWidget* dialog);