Fix compiling of sync on linux.

chrome/browser/sync/util/character_set_converters_linux.cc

 // Copyright (c) 2009 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 "chrome/browser/sync/util/character_set_converters.h"
 
 #include <string>
 
 using std::string;
 
@@ skipping 11 matching lines @@
   return true;
 }
 
 void TrimPathStringToValidCharacter(PathString* string) {
   // Constants from http://en.wikipedia.org/wiki/UTF-8
   CHECK(string);
   if (string->empty())
     return;
   if (0 == (string->at(string->length() - 1) & 0x080))
     return;
-  int partial_enc_bytes = 0;
+  size_t partial_enc_bytes = 0;
   for (partial_enc_bytes = 0 ; true ; ++partial_enc_bytes) {
     if (4 == partial_enc_bytes || partial_enc_bytes == string->length()) {
       // original string was broken, garbage in, garbage out.
       return;
     }
     PathChar c = string->at(string->length() - 1 - partial_enc_bytes);
     if ((c & 0x0c0) == 0x080)  // utf continuation char;
       continue;
     if ((c & 0x0e0) == 0x0e0)  // 2-byte encoded char.
       if (1 == partial_enc_bytes)
         return;
       else
         break;
     if ((c & 0x0f0) == 0xc0)  // 3-byte encoded char.
       if (2 == partial_enc_bytes)
         return;
       else
         break;
     if ((c & 0x0f8) == 0x0f0)  // 4-byte encoded char.
       if (3 == partial_enc_bytes)
         return;
       else
         break;
   }
   string->resize(string->length() - 1 - partial_enc_bytes);
 }
 
 }  // namespace browser_sync