bookmarks: Forward declare DefaultSingletonTraits in bookmark_model_factory.h

chrome/browser/bookmarks/bookmark_model_factory.h

Index: chrome/browser/bookmarks/bookmark_model_factory.h
diff --git a/chrome/browser/bookmarks/bookmark_model_factory.h b/chrome/browser/bookmarks/bookmark_model_factory.h
index 702cccdccee5fa7224c4a31973dae822789e8454..a0e5cd8463fd1bce738830402ce4273204f53a25 100644
--- a/chrome/browser/bookmarks/bookmark_model_factory.h
+++ b/chrome/browser/bookmarks/bookmark_model_factory.h
@@ -5,9 +5,12 @@
 #ifndef CHROME_BROWSER_BOOKMARKS_BOOKMARK_MODEL_FACTORY_H_
 #define CHROME_BROWSER_BOOKMARKS_BOOKMARK_MODEL_FACTORY_H_
 
-#include "base/memory/singleton.h"
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
 #include "chrome/browser/profiles/profile_keyed_service_factory.h"
 
+template <typename T> struct DefaultSingletonTraits;
+
 class Profile;
 class BookmarkModel;
 
@@ -33,6 +36,8 @@ class BookmarkModelFactory : public ProfileKeyedServiceFactory {
   virtual void RegisterUserPrefs(PrefService* user_prefs) OVERRIDE;
   virtual bool ServiceRedirectedInIncognito() OVERRIDE;
   virtual bool ServiceIsNULLWhileTesting() OVERRIDE;
+
+  DISALLOW_COPY_AND_ASSIGN(BookmarkModelFactory);
 };
 
 #endif  // CHROME_BROWSER_BOOKMARKS_BOOKMARK_MODEL_FACTORY_H_