Eliminate Bookmarks dependence to bookmark_undo_utils.h.

chrome/browser/bookmarks/bookmark_model.cc

Index: chrome/browser/bookmarks/bookmark_model.cc
diff --git a/chrome/browser/bookmarks/bookmark_model.cc b/chrome/browser/bookmarks/bookmark_model.cc
index 84b78a8b2cf7ce620a29a6cdf2762c8d7cd21b1f..5eb46381f9d0bfc853bd211d0929744f225435a5 100644
--- a/chrome/browser/bookmarks/bookmark_model.cc
+++ b/chrome/browser/bookmarks/bookmark_model.cc
@@ -284,6 +284,16 @@ void BookmarkModel::EndExtensiveChanges() {
   }
 }
 
+void BookmarkModel::BeginGroupedChanges() {
+  FOR_EACH_OBSERVER(BookmarkModelObserver, observers_,
+                    GroupedBookmarkChangesBeginning(this));
+}
+
+void BookmarkModel::EndGroupedChanges() {
+    FOR_EACH_OBSERVER(BookmarkModelObserver, observers_,
+                      GroupedBookmarkChangesEnded(this));
+}
+
 void BookmarkModel::Remove(const BookmarkNode* parent, int index) {
   if (!loaded_ || !IsValidIndex(parent, index, false) || is_root_node(parent)) {
     NOTREACHED();