Add utf_string_conversions to base namespace.

chrome/browser/extensions/extension_prefs.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/extensions/extension_prefs.h"
 
 #include "base/command_line.h"
 #include "base/prefs/pref_notifier.h"
 #include "base/prefs/pref_service.h"
 #include "base/string_util.h"
@@ skipping 1533 matching lines @@
     const std::string& extension_id) {
   const DictionaryValue* dict = GetExtensionPref(extension_id);
   if (!dict)
     return base::FilePath();
 
   std::string path;
   if (!dict->GetString(kPrefPath, &path))
     return base::FilePath();
 
   return install_directory_.Append(
-      base::FilePath::FromWStringHack(UTF8ToWide(path)));
+      base::FilePath::FromWStringHack(base::UTF8ToWide(path)));
 }
 
 void ExtensionPrefs::UpdateExtensionPref(const std::string& extension_id,
                                          const std::string& key,
                                          Value* data_value) {
   if (!Extension::IdIsValid(extension_id)) {
     NOTREACHED() << "Invalid extension_id " << extension_id;
     return;
   }
   ScopedExtensionPrefUpdate update(prefs_, extension_id);
@@ skipping 805 matching lines @@
     is_enabled = initial_state == Extension::ENABLED;
   }
 
   extension_pref_value_map_->RegisterExtension(extension_id, install_time,
                                                is_enabled);
   content_settings_store_->RegisterExtension(extension_id, install_time,
                                              is_enabled);
 }
 
 }  // namespace extensions