Move MdFocusRing to be a property of FocusManager.

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 f62979e33620de4b43c3d8717585f37501c7d39f..4c1dcc26c004202beffdd34b7afdaa1a2d4a516f 100644
--- a/ui/views/controls/button/md_text_button.h
+++ b/ui/views/controls/button/md_text_button.h
@@ -12,10 +12,6 @@
 
 namespace views {
 
-namespace internal {
-class MdFocusRing;
-}  // namespace internal
-
 // A button class that implements the Material Design text button spec.
 class VIEWS_EXPORT MdTextButton : public LabelButton {
  public:
@@ -37,9 +33,6 @@ class VIEWS_EXPORT MdTextButton : public LabelButton {
   void set_bg_color_override(SkColor color) { bg_color_override_ = color; }
 
   // LabelButton:
-  void Layout() override;
-  void OnFocus() override;
-  void OnBlur() override;
   void OnNativeThemeChanged(const ui::NativeTheme* theme) override;
   std::unique_ptr<views::InkDropRipple> CreateInkDropRipple() const override;
   std::unique_ptr<views::InkDropHighlight> CreateInkDropHighlight()
@@ -63,11 +56,6 @@ class VIEWS_EXPORT MdTextButton : public LabelButton {
   void UpdatePadding();
   void UpdateColors();
 
-  // The MD-style focus ring. This is not done via a FocusPainter
-  // because it needs to paint to a layer so it can extend beyond the bounds of
-  // |this|.
-  internal::MdFocusRing* focus_ring_;
-
   // True if this button uses prominent styling (blue fill, etc.).
   bool is_prominent_;