Remove last dependencies on ui/base from ui/gfx

ui/gfx/screen_type_delegate.h

 // Copyright 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_GFX_SCREEN_TYPE_DELEGATE_H_
 #define UI_GFX_SCREEN_TYPE_DELEGATE_H_
 
 #include "ui/gfx/native_widget_types.h"
 
 namespace gfx {
 
-enum UI_EXPORT ScreenType {
+enum GFX_EXPORT ScreenType {
   SCREEN_TYPE_NATIVE = 0,
 #if defined(OS_CHROMEOS)
   SCREEN_TYPE_ALTERNATE = SCREEN_TYPE_NATIVE,
 #else
   SCREEN_TYPE_ALTERNATE,
 #endif
   SCREEN_TYPE_LAST = SCREEN_TYPE_ALTERNATE,
 };
 
-class UI_EXPORT ScreenTypeDelegate {
+class GFX_EXPORT ScreenTypeDelegate {
  public:
   virtual ~ScreenTypeDelegate() {}
 
   // Determines which ScreenType a given |view| belongs to.
   virtual ScreenType GetScreenTypeForNativeView(NativeView view) = 0;
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_SCREEN_TYPE_DELEGATE_H_