detect preferences errors

chrome/browser/geolocation/network_location_request.cc

Index: chrome/browser/geolocation/network_location_request.cc
diff --git a/chrome/browser/geolocation/network_location_request.cc b/chrome/browser/geolocation/network_location_request.cc
index 01bfd936cdba80ee3073c51f89abeca9e9e1befe..5e38eff4496dbeef2efcb9bc6cd7d7b267d7e882 100644
--- a/chrome/browser/geolocation/network_location_request.cc
+++ b/chrome/browser/geolocation/network_location_request.cc
@@ -292,7 +292,7 @@ bool ParseServerResponse(const std::string& response_body,
   // Parse the response, ignoring comments.
   std::string error_msg;
   scoped_ptr<Value> response_value(base::JSONReader::ReadAndReturnError(
-      response_body, false, &error_msg));
+      response_body, false, NULL, &error_msg));
   if (response_value == NULL) {
     LOG(WARNING) << "ParseServerResponse() : JSONReader failed : "
                  << error_msg << ".\n";