ui: Remove gfx::Size::ClampToNonNegative, prevent negative sizes always.

ui/gfx/rect_f.h

Index: ui/gfx/rect_f.h
diff --git a/ui/gfx/rect_f.h b/ui/gfx/rect_f.h
index 2bc367c94e33cd232a7e4ec025e31cf1e8a1f9ae..272eb3c7b969fee36b0a32872695b2b1af51fea0 100644
--- a/ui/gfx/rect_f.h
+++ b/ui/gfx/rect_f.h
@@ -35,10 +35,7 @@ class UI_EXPORT RectF
 
   void Scale(float x_scale, float y_scale) {
     set_origin(ScalePoint(origin(), x_scale, y_scale));
-
-    SizeF new_size = gfx::ScaleSize(size(), x_scale, y_scale);
-    new_size.ClampToNonNegative();
-    set_size(new_size);
+    set_size(ScaleSize(size(), x_scale, y_scale));
   }
 
   // This method reports if the RectF can be safely converted to an integer