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..4c480dddcd5a70f1998f85ff6375395071c314d3 100644
--- a/ui/views/controls/button/md_text_button.h
+++ b/ui/views/controls/button/md_text_button.h
@@ -38,6 +38,7 @@ class VIEWS_EXPORT MdTextButton : public LabelButton {
                                int thickness,
                                SkAlpha alpha);
 
+  void AdjustFontSize(int size_delta);
   void SetCallToAction(bool cta);
   void set_bg_color_override(SkColor color) { bg_color_override_ = color; }
 
@@ -57,6 +58,7 @@ class VIEWS_EXPORT MdTextButton : public LabelButton {
   MdTextButton(ButtonListener* listener);
   ~MdTextButton() override;
 
+  void UpdatePaddingForFont();
   void UpdateColors();
 
   // The MD-style focus ring. This is not done via a FocusPainter