Remove #pragma once from chrome/browser/{printing,safe_browsing,prefs,bookmarks,autocomplete}

chrome/browser/bookmarks/bookmark_model_observer.h

 // Copyright (c) 2012 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 CHROME_BROWSER_BOOKMARKS_BOOKMARK_MODEL_OBSERVER_H_
 #define CHROME_BROWSER_BOOKMARKS_BOOKMARK_MODEL_OBSERVER_H_
-#pragma once
 
 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 Loaded(BookmarkModel* model, bool ids_reassigned) = 0;
@@ skipping 47 matching lines @@
   // Invoked after an extensive set of model changes has ended.
   // This tells observers to update themselves if they were waiting for the
   // update to finish.
   virtual void ExtensiveBookmarkChangesEnded(BookmarkModel* model) {}
 
  protected:
   virtual ~BookmarkModelObserver() {}
 };
 
 #endif  // CHROME_BROWSER_BOOKMARKS_BOOKMARK_MODEL_OBSERVER_H_