Remove #pragma once from chrome/browser/extensions

chrome/browser/extensions/extension_prefs_unittest.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_EXTENSIONS_EXTENSION_PREFS_UNITTEST_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_PREFS_UNITTEST_H_
-#pragma once
 
 #include "base/message_loop.h"
 #include "chrome/browser/extensions/test_extension_prefs.h"
 #include "content/public/test/test_browser_thread.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace base {
 class Value;
 }
 
@@ skipping 75 matching lines @@
 
   scoped_refptr<Extension> ext1_scoped_;
   scoped_refptr<Extension> ext2_scoped_;
   scoped_refptr<Extension> ext3_scoped_;
   scoped_refptr<Extension> ext4_scoped_;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_PREFS_UNITTEST_H_