Eliminate Bookmarks dependence to bookmark_undo_utils.h.

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 5578bc1825f4e5acc16b393f6a253a9cbda75838..a16f4ad1cc4f1469f420e6812df74a14397a67b3 100644
--- a/chrome/browser/bookmarks/bookmark_model.h
+++ b/chrome/browser/bookmarks/bookmark_model.h
@@ -34,6 +34,7 @@ class BookmarkModelObserver;
 class BookmarkStorage;
 struct BookmarkTitleMatch;
 class Profile;
+class ScopedGroupBookmarkActions;
 
 namespace base {
 class SequencedTaskRunner;
@@ -439,6 +440,7 @@ class BookmarkModel : public content::NotificationObserver,
   friend class BookmarkCodecTest;
   friend class BookmarkModelTest;
   friend class BookmarkStorage;
+  friend class ScopedGroupBookmarkActions;
 
   // Used to order BookmarkNodes by URL.
   class NodeURLComparator {
@@ -514,6 +516,11 @@ class BookmarkModel : public content::NotificationObserver,
   // If we're waiting on a favicon for node, the load request is canceled.
   void CancelPendingFaviconLoadRequests(BookmarkNode* node);
 
+  // Notifies the observers that a set of changes initiated by a single user
+  // action is about to happen and has completed.
+  void BeginGroupedChanges();
+  void EndGroupedChanges();
+
   // content::NotificationObserver:
   virtual void Observe(int type,
                        const content::NotificationSource& source,