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

chrome/browser/flag_descriptions.cc

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/flag_descriptions.h"
 
 namespace flag_descriptions {
 
 //  Material Design version of chrome://bookmarks
 
@@ skipping 2893 matching lines @@
 
 const char kVideoPlayerChromecastSupportDescription[] =
     "This option enables experimental Chromecast support for Video Player "
     "app on ChromeOS.";
 
 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";
 
 const char kOfficeEditingComponentAppDescription[] =
     "Office Editing for Docs, Sheets & Slides for testing purposes.";
 
 const char kDisplayColorCalibrationName[] = "Color calibration of the display";
 
 const char kDisplayColorCalibrationDescription[] =
     "Allow color calibration of the display if the display supports the "
@@ skipping 286 matching lines @@
 
 const char kDisableNewVirtualKeyboardBehaviorName[] =
     "New window behavior for the accessibility keyboard";
 const char kDisableNewVirtualKeyboardBehaviorDescription[] =
     "Disable new window behavior for the accessibility keyboard "
     "in non-sticky mode (do not change work area in non-sticky mode).";
 
 #endif  // defined(OS_CHROMEOS)
 
 }  // namespace flag_descriptions