Remove non-MD code from overflow button and bubble

ash/resources/ash_resources.grd

Index: ash/resources/ash_resources.grd
diff --git a/ash/resources/ash_resources.grd b/ash/resources/ash_resources.grd
index 4e214cb4c3be992f496ddbda1cadb63bc56c05e4..61a63e4afced77e1f50cceb288d712f235db3590 100644
--- a/ash/resources/ash_resources.grd
+++ b/ash/resources/ash_resources.grd
@@ -14,7 +14,6 @@
            SAME CONDITIONALS. -->
       <structure type="chrome_scaled_image" name="IDR_ASH_SHELF_LIST_BROWSER" file="common/shelf/window_switcher_icon_normal.png" />
       <structure type="chrome_scaled_image" name="IDR_ASH_SHELF_LIST_INCOGNITO_BROWSER" file="common/shelf/window_switcher_icon_incognito.png" />
-      <structure type="chrome_scaled_image" name="IDR_ASH_SHELF_OVERFLOW" file="common/shelf/shelf_overflow.png" />
       <structure type="chrome_scaled_image" name="IDR_ASH_SHELF_UNDERLINE_ACTIVE" file="common/shelf/shelf_underline_active.png" />
       <structure type="chrome_scaled_image" name="IDR_ASH_SHELF_UNDERLINE_ATTENTION" file="common/shelf/shelf_underline_attention.png" />
       <structure type="chrome_scaled_image" name="IDR_ASH_SHELF_UNDERLINE_RUNNING" file="common/shelf/shelf_underline_running.png" />
@@ -23,8 +22,6 @@
       <structure type="chrome_scaled_image" name="IDR_ASH_SHELF_ICON_TASK_MANAGER" file="common/shelf/task_manager.png" />
       <structure type="chrome_scaled_image" name="IDR_AURA_MULTI_WINDOW_RESIZE_H" file="common/multi_window_resize_horizontal.png" />
       <structure type="chrome_scaled_image" name="IDR_AURA_MULTI_WINDOW_RESIZE_V" file="common/multi_window_resize_vertical.png" />
-      <structure type="chrome_scaled_image" name="IDR_AURA_NOTIFICATION_BACKGROUND_NORMAL" file="common/shelf/status_icon_background_normal.png" />
-      <structure type="chrome_scaled_image" name="IDR_AURA_NOTIFICATION_BACKGROUND_PRESSED" file="common/shelf/status_icon_background_pressed.png" />
       <structure type="chrome_scaled_image" name="IDR_AURA_PHANTOM_WINDOW_BOTTOM" file="common/phantom_window_bottom.png" />
       <structure type="chrome_scaled_image" name="IDR_AURA_PHANTOM_WINDOW_BOTTOM_LEFT" file="common/phantom_window_bottom_left.png" />
       <structure type="chrome_scaled_image" name="IDR_AURA_PHANTOM_WINDOW_BOTTOM_RIGHT" file="common/phantom_window_bottom_right.png" />