FTP: work around server bugs resulting in negative file size being sent.

net/base/net_util.cc

 // Copyright (c) 2011 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.
 
 #include "net/base/net_util.h"
 
 #include <algorithm>
 #include <iterator>
 #include <map>
 
@@ skipping 1393 matching lines @@
                                    true, &result);
   } else {
     base::JsonDoubleQuote(EscapePath(raw_bytes), true, &result);
   }
   if (is_dir) {
     result.append(",1,");
   } else {
     result.append(",0,");
   }
 
-  base::JsonDoubleQuote(FormatBytesUnlocalized(size), true, &result);
+  // Negative size means unknown or not applicable (e.g. directory).
+  string16 size_string;
+  if (size >= 0)
+    size_string = FormatBytesUnlocalized(size);
+  base::JsonDoubleQuote(size_string, true, &result);
 
   result.append(",");
 
   string16 modified_str;
   // |modified| can be NULL in FTP listings.
   if (!modified.is_null()) {
     modified_str = base::TimeFormatShortDateAndTime(modified);
   }
   base::JsonDoubleQuote(modified_str, true, &result);
 
@@ skipping 1029 matching lines @@
 
 NetworkInterface::NetworkInterface(const std::string& name,
                                    const IPAddressNumber& address)
     : name(name), address(address) {
 }
 
 NetworkInterface::~NetworkInterface() {
 }
 
 }  // namespace net