Remove #pragma once from content

content/browser/geolocation/wifi_data_provider_win.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 CONTENT_BROWSER_GEOLOCATION_WIFI_DATA_PROVIDER_WIN_H_
 #define CONTENT_BROWSER_GEOLOCATION_WIFI_DATA_PROVIDER_WIN_H_
-#pragma once
 
 #include "content/browser/geolocation/wifi_data_provider_common.h"
 #include "content/common/content_export.h"
 
 class PollingPolicyInterface;
 
 class CONTENT_EXPORT Win32WifiDataProvider : public WifiDataProviderCommon {
  public:
   Win32WifiDataProvider();
 
  private:
   virtual ~Win32WifiDataProvider();
 
   // WifiDataProviderCommon
   virtual WlanApiInterface* NewWlanApi();
   virtual PollingPolicyInterface* NewPollingPolicy();
 
   DISALLOW_COPY_AND_ASSIGN(Win32WifiDataProvider);
 };
 
 #endif  // CONTENT_BROWSER_GEOLOCATION_WIFI_DATA_PROVIDER_WIN_H_