Update CrOS logout button for MD.

ui/views/controls/button/md_text_button.h

Index: ui/views/controls/button/md_text_button.h
diff --git a/ui/views/controls/button/md_text_button.h b/ui/views/controls/button/md_text_button.h
index eb6b6fee07dce8a360740be9d6f03150283a973e..5adc6eec9b635d4bc235e60db9df6cce0e28d219 100644
--- a/ui/views/controls/button/md_text_button.h
+++ b/ui/views/controls/button/md_text_button.h
@@ -51,12 +51,18 @@ class VIEWS_EXPORT MdTextButton : public LabelButton {
   SkColor GetInkDropBaseColor() const override;
   bool ShouldShowInkDropForFocus() const override;
   void SetEnabledTextColors(SkColor color) override;
+  void AdjustFontSize(int size_delta) override;
   void UpdateStyleToIndicateDefaultStatus() override;
 
+ protected:
+  // LabelButton:
+  void SetFontList(const gfx::FontList& font_list) override;
+
  private:
   MdTextButton(ButtonListener* listener);
   ~MdTextButton() override;
 
+  void UpdatePaddingForFont();
   void UpdateColors();
 
   // The MD-style focus ring. This is not done via a FocusPainter