[ash-md] Remove non-md code from the Shelf background animations.

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 31f18c9c585f5bbc841e3dcde3d43835706dada7..d45c704cbd15470f5147516447d7477d6ff4b5de 100644
--- a/ash/resources/ash_resources.grd
+++ b/ash/resources/ash_resources.grd
@@ -12,8 +12,6 @@
       <!-- KEEP THESE IN ALPHABETICAL ORDER!  DO NOT ADD TO RANDOM PLACES JUST
            BECAUSE YOUR RESOURCES ARE FUNCTIONALLY RELATED OR FALL UNDER THE
            SAME CONDITIONALS. -->
-      <structure type="chrome_scaled_image" name="IDR_ASH_SHELF_BACKGROUND" file="common/shelf/shelf_background.png" />
-      <structure type="chrome_scaled_image" name="IDR_ASH_SHELF_CORNER" file="common/shelf/shelf_corner.png" />
       <structure type="chrome_scaled_image" name="IDR_ASH_SHELF_ICON_APPLIST" file="common/shelf/status_launcher_menu_icon.png" />
       <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" />