aura: Make 'ui' buildable without gtk.

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 145 matching lines @@
 #if defined(OS_WIN)
   // NOTE: This needs to be called before initializing the shared instance if
   // your resources are not stored in the executable.
   static void SetResourcesDataDLL(HINSTANCE handle);
 
   // Loads and returns an icon from the app module.
   HICON LoadThemeIcon(int icon_id);
 
   // Loads and returns a cursor from the app module.
   HCURSOR LoadCursor(int cursor_id);
-#elif defined(USE_X11)
+#elif defined(TOOLKIT_USES_GTK)
   // Gets the GdkPixbuf with the specified resource_id from the main data pak
   // file. Returns a pointer to a shared instance of the GdkPixbuf.  This
   // shared GdkPixbuf is owned by the resource bundle and should not be freed.
   //
   // The bitmap is assumed to exist. This function will log in release, and
   // assert in debug mode if it does not. On failure, this will return a
   // pointer to a shared empty placeholder bitmap so it will be visible what
   // is missing.
   // This function flips it in RTL locales.
   GdkPixbuf* GetRTLEnabledPixbufNamed(int resource_id);
@@ skipping 133 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_