Remove #pragma once from chrome/browser/extensions

chrome/browser/extensions/settings/settings_namespace.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_SETTINGS_SETTINGS_NAMESPACE_H_
 #define CHROME_BROWSER_EXTENSIONS_SETTINGS_SETTINGS_NAMESPACE_H_
-#pragma once
 
 #include <string>
 
 namespace extensions {
 
 namespace settings_namespace {
 
 // The namespaces of the storage areas.
 enum Namespace {
   LOCAL,  // "local" i.e. chrome.storage.local
   SYNC,   // "sync"  i.e. chrome.storage.sync
   INVALID
 };
 
 // Converts a namespace to its string representation.
 // Namespace must not be INVALID.
 std::string ToString(Namespace settings_namespace);
 
 // Converts a string representation of a namespace to its namespace, or INVALID
 // if the string doesn't map to one.
 Namespace FromString(const std::string& ns_string);
 
 }  // namespace settings_namespace
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_SETTINGS_SETTINGS_NAMESPACE_H_