Rewrite std::string("") to std::string(), Linux edition.

content/browser/geolocation/wifi_data_provider_linux.cc

 // 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.
 
 // Provides wifi scan API binding for suitable for typical linux distributions.
 // Currently, only the NetworkManager API is used, accessed via D-Bus (in turn
 // accessed via the GLib wrapper).
 
 #include "content/browser/geolocation/wifi_data_provider_linux.h"
 
@@ skipping 252 matching lines @@
       if (!response.get())
         continue;
       dbus::MessageReader reader(response.get());
       std::string mac;
       if (!reader.PopVariantOfString(&mac)) {
         LOG(WARNING) << "Unexpected response for " << access_point_path.value()
                      << ": " << response->ToString();
         continue;
       }
 
-      ReplaceSubstringsAfterOffset(&mac, 0U, ":", "");
+      ReplaceSubstringsAfterOffset(&mac, 0U, ":", std::string());
       std::vector<uint8> mac_bytes;
       if (!base::HexStringToBytes(mac, &mac_bytes) || mac_bytes.size() != 6) {
         LOG(WARNING) << "Can't parse mac address (found " << mac_bytes.size()
                      << " bytes) so using raw string: " << mac;
         access_point_data.mac_address = UTF8ToUTF16(mac);
       } else {
         access_point_data.mac_address = MacAddressAsString16(&mac_bytes[0]);
       }
     }
 
@@ skipping 88 matching lines @@
 
 WifiDataProviderCommon::WlanApiInterface*
 WifiDataProviderLinux::NewWlanApiForTesting(dbus::Bus* bus) {
   scoped_ptr<NetworkManagerWlanApi> wlan_api(new NetworkManagerWlanApi);
   if (wlan_api->InitWithBus(bus))
     return wlan_api.release();
   return NULL;
 }
 
 }  // namespace content