Remove last dependencies on ui/base from ui/gfx

ui/gfx/screen.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_GFX_SCREEN_H_
 #define UI_GFX_SCREEN_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "ui/gfx/display.h"
 #include "ui/gfx/gfx_export.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gfx/point.h"
 #include "ui/gfx/screen_type_delegate.h"
 
 namespace gfx {
 class DisplayObserver;
 class Rect;
 
 // A utility class for getting various info about screen size, displays,
 // cursor position, etc.
 //
 // Note that this class does not represent an individual display connected to a
 // computer -- see the Display class for that. A single Screen object exists on
 // most operating systems regardless of the number of connected displays. On
 // Windows 8, two Screens exist: one for Metro UI and another for the desktop.
-class UI_EXPORT Screen {
+class GFX_EXPORT Screen {
  public:
   // Retrieves the Screen that the specified NativeView belongs to. A value of
   // NULL is treated as |SCREEN_TYPE_NATIVE|.
   static Screen* GetScreenFor(NativeView view);
 
   // Returns the SCREEN_TYPE_NATIVE Screen. This should be used with caution,
   // as it is likely to be incorrect for code that runs on Windows.
   static Screen* GetNativeScreen();
 
   // Sets the global screen for a particular screen type. Only the _NATIVE
@@ skipping 51 matching lines @@
 
  private:
   DISALLOW_COPY_AND_ASSIGN(Screen);
 };
 
 Screen* CreateNativeScreen();
 
 }  // namespace gfx
 
 #endif  // UI_GFX_SCREEN_H_