Remove #pragma once from content

content/browser/geolocation/wifi_data_provider_mac.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_MAC_H_
 #define CONTENT_BROWSER_GEOLOCATION_WIFI_DATA_PROVIDER_MAC_H_
-#pragma once
 
 #include "content/browser/geolocation/wifi_data_provider_common.h"
 
 // Implementation of the wifi data provider for Mac OSX. Uses different API
 // bindings depending on APIs detected available at runtime in order to access
 // wifi scan data: Apple80211.h on OSX 10.5, CoreWLAN framework on OSX 10.6.
 class MacWifiDataProvider : public WifiDataProviderCommon {
  public:
   MacWifiDataProvider();
 
  private:
   virtual ~MacWifiDataProvider();
 
   // WifiDataProviderCommon
   virtual WlanApiInterface* NewWlanApi() OVERRIDE;
   virtual PollingPolicyInterface* NewPollingPolicy() OVERRIDE;
 
   DISALLOW_COPY_AND_ASSIGN(MacWifiDataProvider);
 };
 
 // Creates and returns a new API binding for the CoreWLAN API, or NULL if the
 // API can not be initialized.
 WifiDataProviderCommon::WlanApiInterface* NewCoreWlanApi();
 
 #endif  // CONTENT_BROWSER_GEOLOCATION_WIFI_DATA_PROVIDER_MAC_H_