Remove #pragma once from chrome/browser/extensions

chrome/browser/extensions/extension_scoped_prefs.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_SCOPED_PREFS_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_SCOPED_PREFS_H_
-#pragma once
 
 class ExtensionScopedPrefs {
  public:
   ExtensionScopedPrefs() {}
   ~ExtensionScopedPrefs() {}
 
   // Sets the pref |key| for extension |id| to |value|.
   virtual void UpdateExtensionPref(const std::string& id,
                                    const std::string& key,
                                    base::Value* value) = 0;
@@ skipping 16 matching lines @@
       const std::string& pref_key,
       const base::ListValue** out_value) const = 0;
 
   // Reads a string pref |pref_key| from extension with id |extension_id|.
   virtual bool ReadExtensionPrefString(const std::string& extension_id,
                                        const std::string& pref_key,
                                        std::string* out_value) const = 0;
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_SCOPED_PREFS_H_