Alternate NTP: Don't hide bookmark bar on instant

chrome/browser/ui/cocoa/browser_window_cocoa.mm

Index: chrome/browser/ui/cocoa/browser_window_cocoa.mm
diff --git a/chrome/browser/ui/cocoa/browser_window_cocoa.mm b/chrome/browser/ui/cocoa/browser_window_cocoa.mm
index e09901bea8e488d530f95b9f3626b372bf343841..14de26640670208519707d8530659ac25f46c3bf 100644
--- a/chrome/browser/ui/cocoa/browser_window_cocoa.mm
+++ b/chrome/browser/ui/cocoa/browser_window_cocoa.mm
@@ -42,6 +42,7 @@
 #import "chrome/browser/ui/cocoa/web_dialog_window_controller.h"
 #import "chrome/browser/ui/cocoa/website_settings_bubble_controller.h"
 #include "chrome/browser/ui/page_info_bubble.h"
+#include "chrome/browser/ui/search/search_model.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/pref_names.h"
 #include "content/public/browser/native_web_keyboard_event.h"
@@ -112,9 +113,12 @@ BrowserWindowCocoa::BrowserWindowCocoa(Browser* browser,
   chrome::GetSavedWindowBoundsAndShowState(browser_,
                                            &bounds,
                                            &initial_show_state_);
+
+  browser_->search_model()->AddObserver(this);
 }
 
 BrowserWindowCocoa::~BrowserWindowCocoa() {
+  browser_->search_model()->RemoveObserver(this);
 }
 
 void BrowserWindowCocoa::Show() {
@@ -646,6 +650,12 @@ extensions::ActiveTabPermissionGranter*
   return tab_helper ? tab_helper->active_tab_permission_granter() : NULL;
 }
 
+void BrowserWindowCocoa::ModeChanged(
+    const chrome::search::Mode& old_mode,
+    const chrome::search::Mode& new_mode) {
+  [controller_ updateBookmarkBarStateForInstantPreview];
+}
+
 void BrowserWindowCocoa::DestroyBrowser() {
   [controller_ destroyBrowser];