Remove last dependencies on ui/base from ui/gfx

ui/gfx/size.h

Index: ui/gfx/size.h
diff --git a/ui/gfx/size.h b/ui/gfx/size.h
index c2340ebce6324a74c523a527d77740fb39324810..c96f5897f3b72d82770668dcc6828f17da4ce2ce 100644
--- a/ui/gfx/size.h
+++ b/ui/gfx/size.h
@@ -23,7 +23,7 @@ typedef struct tagSIZE SIZE;
 namespace gfx {
 
 // A size has width and height values.
-class UI_EXPORT Size : public SizeBase<Size, int> {
+class GFX_EXPORT Size : public SizeBase<Size, int> {
  public:
   Size() : SizeBase<Size, int>(0, 0) {}
   Size(int width, int height) : SizeBase<Size, int>(width, height) {}