Remove USE_BASE_DATA_PACK from build_config.h since it's only

ui/base/resource/resource_bundle.h

 // Copyright (c) 2011 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_RESOURCE_RESOURCE_BUNDLE_H_
 #define UI_BASE_RESOURCE_RESOURCE_BUNDLE_H_
 #pragma once
 
 #include "build/build_config.h"
 
@@ skipping 189 matching lines @@
     FilePath path_;
 
     DISALLOW_COPY_AND_ASSIGN(LoadedDataPack);
   };
 
   // We define a DataHandle typedef to abstract across how data is stored
   // across platforms.
 #if defined(OS_WIN)
   // Windows stores resources in DLLs, which are managed by HINSTANCE.
   typedef HINSTANCE DataHandle;
-#elif defined(USE_BASE_DATA_PACK)
-  // Linux uses base::DataPack.
+#elif defined(OS_POSIX)
+  // Everyone else uses base::DataPack.
   typedef DataPack* DataHandle;
 #endif
 
   // Ctor/dtor are private, since we're a singleton.
   ResourceBundle();
   ~ResourceBundle();
 
   // Free skia_images_.
   void FreeImages();
 
   // Load the main resources.
   void LoadCommonResources();
 
   // Try to load the locale specific strings from an external data module.
   // Returns the locale that is loaded.
   std::string LoadLocaleResources(const std::string& pref_locale);
 
   // Load test resources in given path.
   void LoadTestResources(const FilePath& path);
 
   // Unload the locale specific strings and prepares to load new ones. See
   // comments for ReloadSharedInstance().
   void UnloadLocaleResources();
 
   // Initialize all the gfx::Font members if they haven't yet been initialized.
   void LoadFontsIfNecessary();
 
-#if defined(USE_BASE_DATA_PACK)
+#if defined(OS_POSIX)
   // Returns the full pathname of the main resources file to load.  May return
   // an empty string if no main resources data files are found.
   static FilePath GetResourcesFilePath();
 
   static FilePath GetLargeIconResourcesFilePath();
 #endif
 
   // Returns the full pathname of the locale file to load.  May return an empty
   // string if no locale data files are found.
   static FilePath GetLocaleFilePath(const std::string& app_locale);
@@ skipping 45 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(ResourceBundle);
 };
 
 }  // namespace ui
 
 // TODO(beng): Someday, maybe, get rid of this.
 using ui::ResourceBundle;
 
 #endif  // UI_BASE_RESOURCE_RESOURCE_BUNDLE_H_