Handful of related instant changes:

chrome/browser/gtk/instant_confirm_dialog_gtk.cc

 // Copyright (c) 2010 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/gtk/instant_confirm_dialog_gtk.h"
 
 #include <gtk/gtk.h>
 
 #include "app/l10n_util.h"
 #include "chrome/browser/gtk/gtk_chrome_link_button.h"
 #include "chrome/browser/gtk/gtk_util.h"
 #include "chrome/browser/instant/instant_confirm_dialog.h"
-#include "chrome/browser/prefs/pref_service.h"
+#include "chrome/browser/instant/instant_controller.h"
 #include "chrome/browser/profile.h"
 #include "chrome/browser/show_options_url.h"
-#include "chrome/common/pref_names.h"
 #include "googleurl/src/gurl.h"
 #include "grit/generated_resources.h"
 
 namespace browser {
 
 void ShowInstantConfirmDialog(GtkWindow* parent, Profile* profile) {
   new InstantConfirmDialogGtk(parent, profile);
 }
 
 }  // namespace browser
@@ skipping 32 matching lines @@
   gtk_dialog_set_default_response(GTK_DIALOG(dialog_), GTK_RESPONSE_ACCEPT);
   gtk_widget_show_all(dialog_);
 }
 
 InstantConfirmDialogGtk::~InstantConfirmDialogGtk() {
   gtk_widget_destroy(dialog_);
 }
 
 void InstantConfirmDialogGtk::OnDialogResponse(GtkWidget* dialog,
                                                int response) {
-  if (response == GTK_RESPONSE_ACCEPT) {
-    PrefService* service = profile_->GetPrefs();
-    if (service) {
-      service->SetBoolean(prefs::kInstantEnabled, true);
-      service->SetBoolean(prefs::kInstantConfirmDialogShown, true);
-    }
-  }
+  if (response == GTK_RESPONSE_ACCEPT)
+    InstantController::Enable(profile_);
 
   delete this;
 }
 
 void InstantConfirmDialogGtk::OnLinkButtonClicked(GtkWidget* button) {
   browser::ShowOptionsURL(profile_, GURL(browser::kInstantLearnMoreURL));
 }