Use views::style for buttons, bootstrap ash_typography to do so.

chrome/browser/ui/views/profiles/new_avatar_button.cc

Index: chrome/browser/ui/views/profiles/new_avatar_button.cc
diff --git a/chrome/browser/ui/views/profiles/new_avatar_button.cc b/chrome/browser/ui/views/profiles/new_avatar_button.cc
index 795ca239a216e99c1280e4eaff0747fdef293a11..b2e9118d08431fe7df3091c1cc798ba5bb3ef24b 100644
--- a/chrome/browser/ui/views/profiles/new_avatar_button.cc
+++ b/chrome/browser/ui/views/profiles/new_avatar_button.cc
@@ -74,7 +74,7 @@ NewAvatarButton::NewAvatarButton(AvatarButtonDelegate* delegate,
   // is larger than this, it will be shrunk to match it.
   // TODO(noms): Calculate this constant algorithmically from the button's size.
   const int kDisplayFontHeight = 16;
-  SetFontList(
+  label()->SetFontList(
       label()->font_list().DeriveWithHeightUpperBound(kDisplayFontHeight));
 
   ui::ResourceBundle* rb = &ui::ResourceBundle::GetSharedInstance();