Fix the build when disable_ftp_support is set to 1

content/child/ftp_directory_listing_response_delegate.cc

Index: content/child/ftp_directory_listing_response_delegate.cc
diff --git a/content/child/ftp_directory_listing_response_delegate.cc b/content/child/ftp_directory_listing_response_delegate.cc
index c3cc82705d9d281273eaa14b06a1183a20719884..3449555137380c48ec22fed36a4a07e34b8e47e1 100644
--- a/content/child/ftp_directory_listing_response_delegate.cc
+++ b/content/child/ftp_directory_listing_response_delegate.cc
@@ -82,7 +82,10 @@ void FtpDirectoryListingResponseDelegate::OnReceivedData(const char* data,
 
 void FtpDirectoryListingResponseDelegate::OnCompletedRequest() {
   std::vector<FtpDirectoryListingEntry> entries;
-  int rv = net::ParseFtpDirectoryListing(buffer_, base::Time::Now(), &entries);
+  int rv = -1;
+#if !defined(DISABLE_FTP_SUPPORT)
+  rv = net::ParseFtpDirectoryListing(buffer_, base::Time::Now(), &entries);
+#endif
   if (rv != net::OK) {
     SendDataToClient("<script>onListingParsingError();</script>\n");
     return;