Makes the default ctor of gfx::FontList copy the pre-calculated metrics.

ui/gfx/font_list.h

Index: ui/gfx/font_list.h
diff --git a/ui/gfx/font_list.h b/ui/gfx/font_list.h
index e37fd625a23dccf76f296c9062958c49c2000a9b..244da8835a07ee17faf591f1837bee275a4a2df3 100644
--- a/ui/gfx/font_list.h
+++ b/ui/gfx/font_list.h
@@ -34,7 +34,8 @@ namespace gfx {
 // and operator= is used in RenderText::SetFontList().
 class GFX_EXPORT FontList {
  public:
-  // Creates a font list with a Font with default name and style.
+  // Creates a font list with default font names, size and style, which are
+  // specified by SetDefaultFontDescription().
   FontList();
 
   // Creates a font list from a string representing font names, styles, and