Add utf_string_conversions to base namespace.

chrome/common/extensions/extension_file_util.cc

 // Copyright (c) 2012 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/common/extensions/extension_file_util.h"
 
 #include <map>
 #include <vector>
 
 #include "base/file_util.h"
@@ skipping 689 matching lines @@
   std::string file_path = net::UnescapeURLComponent(url_path,
       net::UnescapeRule::SPACES | net::UnescapeRule::URL_SPECIAL_CHARS);
   size_t skip = file_path.find_first_not_of("/\\");
   if (skip != file_path.npos)
     file_path = file_path.substr(skip);
 
   base::FilePath path =
 #if defined(OS_POSIX)
     base::FilePath(file_path);
 #elif defined(OS_WIN)
-    base::FilePath(UTF8ToWide(file_path));
+    base::FilePath(base::UTF8ToWide(file_path));
 #else
     base::FilePath();
     NOTIMPLEMENTED();
 #endif
 
   // It's still possible for someone to construct an annoying URL whose path
   // would still wind up not being considered relative at this point.
   // For example: chrome-extension://id/c:////foo.html
   if (path.IsAbsolute())
     return base::FilePath();
@@ skipping 51 matching lines @@
     return base::FilePath();
   }
   return temp_path;
 }
 
 void DeleteFile(const base::FilePath& path, bool recursive) {
   file_util::Delete(path, recursive);
 }
 
 }  // namespace extension_file_util