Remove last dependencies on ui/base from ui/gfx

ui/gfx/gtk_native_view_id_manager.h

Index: ui/gfx/gtk_native_view_id_manager.h
diff --git a/ui/gfx/gtk_native_view_id_manager.h b/ui/gfx/gtk_native_view_id_manager.h
index 242cf0939e30713fa9ba02040ebafe2851349519..442192092737cc4ec9a011d2734acf5856474240 100644
--- a/ui/gfx/gtk_native_view_id_manager.h
+++ b/ui/gfx/gtk_native_view_id_manager.h
@@ -31,7 +31,7 @@ struct _GtkPreserveWindow;
 // pointers and observes the various signals from the widget for when an X
 // window is created, destroyed etc. Thus it provides a thread safe mapping
 // from NativeViewIds to the current XID for that widget.
-class UI_EXPORT GtkNativeViewManager {
+class GFX_EXPORT GtkNativeViewManager {
  public:
   // Returns the singleton instance.
   static GtkNativeViewManager* GetInstance();