bookmarks: Move BookmarkModelObserver 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 BookmarkModel;
 class BookmarkNode;
 class GURL;
 
+namespace bookmarks {
+
 // 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.
   virtual void BookmarkModelBeingDeleted(BookmarkModel* model) {}
@@ skipping 104 matching lines @@
   virtual void GroupedBookmarkChangesBeginning(BookmarkModel* model) {}
 
   // Invoked after a set of model changes triggered by a single user action has
   // ended.
   virtual void GroupedBookmarkChangesEnded(BookmarkModel* model) {}
 
  protected:
   virtual ~BookmarkModelObserver() {}
 };
 
+}  // namespace bookmarks
+
 #endif  // COMPONENTS_BOOKMARKS_BROWSER_BOOKMARK_MODEL_OBSERVER_H_