Remove non-MD code from AppListButton

ash/common/shelf/app_list_button.h

Index: ash/common/shelf/app_list_button.h
diff --git a/ash/common/shelf/app_list_button.h b/ash/common/shelf/app_list_button.h
index e6d55bf182ebe03d9b56d1c4a6e2e144c14aa9d6..d4a0fbeeb7f5160d5ea739a1496b12612526af2e 100644
--- a/ash/common/shelf/app_list_button.h
+++ b/ash/common/shelf/app_list_button.h
@@ -28,8 +28,6 @@ class ASH_EXPORT AppListButton : public views::ImageButton {
 
   bool is_showing_app_list() const { return is_showing_app_list_; }
 
-  bool draw_background_as_active() const { return draw_background_as_active_; }
-
   // Updates background and schedules a paint.
   void UpdateShelfItemBackground(SkColor color);
 
@@ -51,17 +49,6 @@ class ASH_EXPORT AppListButton : public views::ImageButton {
   void OnGestureEvent(ui::GestureEvent* event) override;
 
  private:
-  // Toggles the active state for painting the background and schedules a paint.
-  void SetDrawBackgroundAsActive(bool draw_background_as_active);
-
-  // Helper function to paint the background and foreground of the AppList
-  // button in Chrome OS MD.
-  void PaintMd(gfx::Canvas* canvas);
-
-  // Helper function to paint the AppList button in Chrome OS non-MD.
-  void PaintAppListButton(gfx::Canvas* canvas,
-                          const gfx::ImageSkia& foreground_image);
-
   // Get the center point of the app list button used to draw its background and
   // ink drops.
   gfx::Point GetCenterPoint() const;
@@ -70,10 +57,6 @@ class ASH_EXPORT AppListButton : public views::ImageButton {
   // This is useful because other IsApplistVisible functions aren't per-display.
   bool is_showing_app_list_;
 
-  // True if the background should render as active, regardless of the state of
-  // the application list.
-  bool draw_background_as_active_;
-
   // Color used to paint the background.
   SkColor background_color_;