Fix a pair of bugs in UNIX->VMS path conversion.

net/ftp/ftp_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/ftp/ftp_util.h"
 
 #include <map>
 #include <vector>
 
 #include "base/i18n/case_conversion.h"
@@ skipping 27 matching lines @@
 
   base::StringTokenizer tokenizer(unix_path, "/");
   std::vector<std::string> tokens;
   while (tokenizer.GetNext())
     tokens.push_back(tokenizer.token());
 
   if (unix_path[0] == '/') {
     // It's an absolute path.
 
     if (tokens.empty()) {
-      DCHECK_EQ(1U, unix_path.length());
+      // It's just "/" or a series of slashes, which all mean the same thing.
       return "[]";
     }
 
     if (tokens.size() == 1)
-      return unix_path.substr(1);  // Drop the leading slash.
+      return tokens.front();  // Return without leading slashes.
 
     std::string result(tokens[0] + ":[");
     if (tokens.size() == 2) {
       // Don't ask why, it just works that way on VMS.
       result.append("000000");
     } else {
       result.append(tokens[1]);
       for (size_t i = 2; i < tokens.size() - 1; i++)
         result.append("." + tokens[i]);
     }
@@ skipping 303 matching lines @@
     while (!iter.end() && !u_isspace(iter.get()))
       iter.Advance();
   }
 
   base::string16 result(text.substr(iter.array_pos()));
   base::TrimWhitespace(result, base::TRIM_ALL, &result);
   return result;
 }
 
 }  // namespace net