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

chrome/browser/ui/gtk/about_chrome_dialog.cc

Index: chrome/browser/ui/gtk/about_chrome_dialog.cc
diff --git a/chrome/browser/ui/gtk/about_chrome_dialog.cc b/chrome/browser/ui/gtk/about_chrome_dialog.cc
index 4bd9bcf3990d986b6ce882f9e5f905022f698591..49909c69425ee418908d50870cc4121b58001fd1 100644
--- a/chrome/browser/ui/gtk/about_chrome_dialog.cc
+++ b/chrome/browser/ui/gtk/about_chrome_dialog.cc
@@ -50,9 +50,9 @@ const char* kEndLinkOss = "END_LINK_OSS";
 const char* kBeginLink = "BEGIN_LINK";
 const char* kEndLink = "END_LINK";
 
-void OnDialogResponse(GtkDialog* dialog, int response_id) {
+void OnResponse(GtkWidget* dialog, int response_id) {
   // We're done.
-  gtk_widget_destroy(GTK_WIDGET(dialog));
+  gtk_widget_destroy(dialog);
 }
 
 GtkWidget* MakeMarkupLabel(const char* format, const std::string& str) {
@@ -280,7 +280,7 @@ void ShowAboutDialogForProfile(GtkWindow* parent, Profile* profile) {
   gtk_container_add(GTK_CONTAINER(alignment), vbox);
   gtk_box_pack_start(GTK_BOX(content_area), alignment, FALSE, FALSE, 0);
 
-  g_signal_connect(dialog, "response", G_CALLBACK(OnDialogResponse), NULL);
+  g_signal_connect(dialog, "response", G_CALLBACK(OnResponse), NULL);
   gtk_window_set_resizable(GTK_WINDOW(dialog), FALSE);
   gtk_widget_show_all(dialog);
   gtk_widget_grab_focus(close_button);