Fon't drop the FontSelector in LayoutThemeMac::setFontFromControlSize.

Source/core/layout/LayoutThemeMac.mm

Index: Source/core/layout/LayoutThemeMac.mm
diff --git a/Source/core/layout/LayoutThemeMac.mm b/Source/core/layout/LayoutThemeMac.mm
index 3f09121fe1bf322e9b1f45181793c57d71626253..4f6510d2b7db2e7f41d076be7bfe5853ad9f43df 100644
--- a/Source/core/layout/LayoutThemeMac.mm
+++ b/Source/core/layout/LayoutThemeMac.mm
@@ -599,8 +599,10 @@ void LayoutThemeMac::setFontFromControlSize(ComputedStyle& style, NSControlSize
     // Reset line height.
     style.setLineHeight(ComputedStyle::initialLineHeight());
 
+    // TODO(esprehn): The fontSelector manual management is buggy and error prone.
+    FontSelector* fontSelector = style.font().fontSelector();
     if (style.setFontDescription(fontDescription))
-        style.font().update(nullptr);
+        style.font().update(fontSelector);
 }
 
 NSControlSize LayoutThemeMac::controlSizeForSystemFont(const ComputedStyle& style) const