Fixed behavior of the bookmark bar visibility.

chrome/browser/bookmarks/bookmark_model.h

Index: chrome/browser/bookmarks/bookmark_model.h
diff --git a/chrome/browser/bookmarks/bookmark_model.h b/chrome/browser/bookmarks/bookmark_model.h
index 5f42c1c223cdbfb6ab07b3f86de897d7d50621d1..244c0afe5f7a5c6f5d49dd6d4e51dbe56eb21707 100644
--- a/chrome/browser/bookmarks/bookmark_model.h
+++ b/chrome/browser/bookmarks/bookmark_model.h
@@ -11,6 +11,8 @@
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
 #include "base/observer_list.h"
 #include "base/string16.h"
 #include "base/synchronization/lock.h"
@@ -18,6 +20,7 @@
 #include "chrome/browser/bookmarks/bookmark_service.h"
 #include "chrome/browser/favicon/favicon_service.h"
 #include "chrome/browser/history/history.h"
+#include "chrome/browser/prefs/pref_change_registrar.h"
 #include "content/browser/cancelable_request.h"
 #include "content/common/notification_registrar.h"
 #include "googleurl/src/gurl.h"
@@ -417,6 +420,9 @@ class BookmarkModel : public NotificationObserver, public BookmarkService {
 
   NotificationRegistrar registrar_;
 
+  // Listens for changes to the kShowBookmarkBar preference.
+  PrefChangeRegistrar pref_change_registrar_;
+
   Profile* profile_;
 
   // Whether the initial set of data has been loaded.