Remove last dependencies on ui/base from ui/gfx

ui/gfx/selection_model.h

Index: ui/gfx/selection_model.h
diff --git a/ui/gfx/selection_model.h b/ui/gfx/selection_model.h
index 0b811d1c5cea6f43d3a49147d571fcb62fbc57ff..d509e898a99fef9ce03982be0fd908f85194726c 100644
--- a/ui/gfx/selection_model.h
+++ b/ui/gfx/selection_model.h
@@ -56,7 +56,7 @@ enum LogicalCursorDirection {
 // is given by a "caret affinity" which is either CURSOR_BACKWARD (indicating
 // the trailing half of the 'c' in this case) or CURSOR_FORWARD (indicating
 // the leading half of the 'D').
-class UI_EXPORT SelectionModel {
+class GFX_EXPORT SelectionModel {
  public:
   // Create a default SelectionModel to be overwritten later.
   SelectionModel();