ui: Fix the path of DIR_TEST_DATA key.

ui/base/ui_base_paths.h

 // 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.
 
 #ifndef UI_BASE_UI_BASE_PATHS_H_
 #define UI_BASE_UI_BASE_PATHS_H_
 
 #include "build/build_config.h"
 #include "ui/base/ui_base_export.h"
 
 // This file declares path keys for various special directories. These can be
 // used with the PathService to access these directories and files.
 
 namespace ui {
 
 enum {
   PATH_START = 3000,
 
   DIR_LOCALES,              // Directory where locale resources are stored.
 
   // Valid only in development environment; TODO(darin): move this
-  DIR_TEST_DATA,            // Directory where unit test data resides.
+  UI_DIR_TEST_DATA,            // Directory where unit test data resides.
 
 #if defined(OS_ANDROID)
   DIR_RESOURCE_PAKS_ANDROID,
 #endif
 
   UI_TEST_PAK,
 
   PATH_END
 };
 
 // Call once to register the provider for the path keys defined above.
 UI_BASE_EXPORT void RegisterPathProvider();
 
 }  // namespace ui
 
 #endif  // UI_BASE_UI_BASE_PATHS_H_