gtk: Rename OnDialogResponse() to OnResponse() to standardize on a consistent naming scheme.

chrome/browser/ui/input_window_dialog_gtk.cc

Index: chrome/browser/ui/input_window_dialog_gtk.cc
diff --git a/chrome/browser/ui/input_window_dialog_gtk.cc b/chrome/browser/ui/input_window_dialog_gtk.cc
index 4b2c3f72849273631c8aa0f827b154460f353f41..e432d29670533f2a1923936bcac8019beb7df5cc 100644
--- a/chrome/browser/ui/input_window_dialog_gtk.cc
+++ b/chrome/browser/ui/input_window_dialog_gtk.cc
@@ -98,7 +98,7 @@ void InputWindowDialogGtk::Close() {
   // Under the model that we've inherited from Windows, dialogs can receive
   // more than one Close() call inside the current message loop event.
   if (dialog_) {
-    gtk_widget_destroy(GTK_WIDGET(dialog_));
+    gtk_widget_destroy(dialog_);
     dialog_ = NULL;
   }
 }