Rework wifi_data_provider_linux.cc with our D-Bus library.

content/browser/geolocation/wifi_data_provider_linux.h

 // Copyright (c) 2010 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_LINUX_H_
 #define CONTENT_BROWSER_GEOLOCATION_WIFI_DATA_PROVIDER_LINUX_H_
 #pragma once
 
 #include "content/browser/geolocation/wifi_data_provider_common.h"
 
+namespace dbus {
+class Bus;
+};
+
 class WifiDataProviderLinux : public WifiDataProviderCommon {
  public:
   WifiDataProviderLinux();
 
  private:
+  friend class GeolocationWifiDataProviderLinuxTest;
+
   virtual ~WifiDataProviderLinux();
 
   // WifiDataProviderCommon
   virtual WlanApiInterface* NewWlanApi();
   virtual PollingPolicyInterface* NewPollingPolicy();
 
+  // For testing.
+  WlanApiInterface* NewWlanApiForTesting(dbus::Bus* bus);
+
   DISALLOW_COPY_AND_ASSIGN(WifiDataProviderLinux);
 };
 
 #endif  // CONTENT_BROWSER_GEOLOCATION_WIFI_DATA_PROVIDER_LINUX_H_