Add utf_string_conversions to base namespace.

chrome/browser/ui/webui/fileicon_source.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/browser/ui/webui/fileicon_source.h"
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/files/file_path.h"
@@ skipping 34 matching lines @@
   // We receive the url with chrome://fileicon/ stripped but GURL expects it.
   const GURL gurl("chrome://fileicon/" + url);
   std::string path = net::UnescapeURLComponent(
       gurl.path().substr(1), (net::UnescapeRule::URL_SPECIAL_CHARS |
                               net::UnescapeRule::SPACES));
 
 #if defined(OS_WIN)
   // The path we receive has the wrong slashes and escaping for what we need;
   // this only appears to matter for getting icons from .exe files.
   std::replace(path.begin(), path.end(), '/', '\\');
-  *file_path = base::FilePath(UTF8ToWide(path));
+  *file_path = base::FilePath(base::UTF8ToWide(path));
 #elif defined(OS_POSIX)
   // The correct encoding on Linux may not actually be UTF8.
   *file_path = base::FilePath(path);
 #endif
   query->assign(gurl.query());
 }
 
 IconLoader::IconSize SizeStringToIconSize(const std::string& size_string) {
   if (size_string == "small") return IconLoader::SMALL;
   if (size_string == "large") return IconLoader::LARGE;
@@ skipping 95 matching lines @@
             .sk_bitmap(),
         false,
         &icon_data->data());
 
     details.callback.Run(icon_data);
   } else {
     // TODO(glen): send a dummy icon.
     details.callback.Run(NULL);
   }
 }