Make dbus-based wifi data provider optional on linux

content/browser/geolocation/empty_wifi_data_provider.cc

Index: content/browser/geolocation/empty_wifi_data_provider.cc
diff --git a/content/browser/geolocation/empty_wifi_data_provider.cc b/content/browser/geolocation/empty_wifi_data_provider.cc
index 7255f46fcc95b5ff19aae502bb31b0b7a1907ebc..d24213155d51329f49651d3bf8f5e063dac23fae 100644
--- a/content/browser/geolocation/empty_wifi_data_provider.cc
+++ b/content/browser/geolocation/empty_wifi_data_provider.cc
@@ -18,12 +18,9 @@ bool EmptyWifiDataProvider::GetData(WifiData* data) {
   return true;
 }
 
-// Only define for platforms that lack a real wifi data provider.
-#if !defined(OS_WIN) && !defined(OS_MACOSX) && !defined(OS_LINUX)
 // static
 WifiDataProviderImplBase* WifiDataProvider::DefaultFactoryFunction() {
   return new EmptyWifiDataProvider();
 }
-#endif
 
 }  // namespace content