Remove the chrome flag to show/hide ARC files app in launcher.

chrome/browser/flag_descriptions.cc

Index: chrome/browser/flag_descriptions.cc
diff --git a/chrome/browser/flag_descriptions.cc b/chrome/browser/flag_descriptions.cc
index c8a324b710a1c3c447abbe452838c826e132cf45..d10e19f55da3300cf75d7950e5e84bbd6f98d0cf 100644
--- a/chrome/browser/flag_descriptions.cc
+++ b/chrome/browser/flag_descriptions.cc
@@ -2911,12 +2911,6 @@ const char kNewZipUnpackerName[] = "New ZIP unpacker";
 const char kNewZipUnpackerDescription[] =
     "New ZIP unpacker flow, based on the File System Provider API.";
 
-const char kShowArcFilesAppName[] = "Show Android Files app";
-
-const char kShowArcFilesAppDescription[] =
-    "Show Android Files app in Chrome OS launcher. This is only effective "
-    "on a device with access to Play Store.";
-
 const char kOfficeEditingComponentAppName[] =
     "Office Editing for Docs, Sheets & Slides";