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

chrome/browser/printing/print_view_manager_observer.h

 // Copyright (c) 2011 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_PRINTING_PRINT_VIEW_MANAGER_OBSERVER_H_
 #define CHROME_BROWSER_PRINTING_PRINT_VIEW_MANAGER_OBSERVER_H_
-#pragma once
 
 namespace printing {
 
 // An interface the PrintViewManager uses to notify an observer when the print
 // dialog is shown. Register the observer via PrintViewManager::set_observer.
 class PrintViewManagerObserver {
  public:
   // Notifies the observer that the print dialog was shown.
   virtual void OnPrintDialogShown() = 0;
 
  protected:
   virtual ~PrintViewManagerObserver() {}
 };
 
 }  // namespace printing
 
 #endif  // CHROME_BROWSER_PRINTING_PRINT_VIEW_MANAGER_OBSERVER_H_