bookmarks: Move BookmarkNode into 'bookmarks' namespace.

components/bookmarks/browser/bookmark_model_observer.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_BOOKMARKS_BROWSER_BOOKMARK_MODEL_OBSERVER_H_
 #define COMPONENTS_BOOKMARKS_BROWSER_BOOKMARK_MODEL_OBSERVER_H_
 
 #include <set>
 
-class BookmarkNode;
 class GURL;
 
 namespace bookmarks {
 
 class BookmarkModel;
+class BookmarkNode;
 
 // Observer for the BookmarkModel.
 class BookmarkModelObserver {
  public:
   // Invoked when the model has finished loading. |ids_reassigned| mirrors
   // that of BookmarkLoadDetails::ids_reassigned. See it for details.
   virtual void BookmarkModelLoaded(BookmarkModel* model,
                                    bool ids_reassigned) = 0;
 
   // Invoked from the destructor of the BookmarkModel.
@@ skipping 108 matching lines @@
   // ended.
   virtual void GroupedBookmarkChangesEnded(BookmarkModel* model) {}
 
  protected:
   virtual ~BookmarkModelObserver() {}
 };
 
 }  // namespace bookmarks
 
 #endif  // COMPONENTS_BOOKMARKS_BROWSER_BOOKMARK_MODEL_OBSERVER_H_