--- chrome/app/theme/theme_resources.grd.orig	2021-04-14 18:40:52 UTC
+++ chrome/app/theme/theme_resources.grd
@@ -25,7 +25,7 @@
       <!-- KEEP THESE IN ALPHABETICAL ORDER!  DO NOT ADD TO RANDOM PLACES JUST
            BECAUSE YOUR RESOURCES ARE FUNCTIONALLY RELATED OR FALL UNDER THE
            SAME CONDITIONALS. -->
-      <if expr="is_linux or is_win or chromeos">
+      <if expr="is_posix or is_win or chromeos">
         <structure type="chrome_scaled_image" name="IDR_ACCESSIBILITY_CAPTIONS_PREVIEW_BACKGROUND" file="common/captions-preview-bg.png" />
       </if>
       <if expr="toolkit_views and not is_macosx">