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

chrome/browser/about_flags.cc

 // Copyright (c) 2012 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/about_flags.h"
 
 #include <iterator>
 #include <map>
 #include <set>
 #include <utility>
@@ skipping 2745 matching lines @@
 #if defined(OS_WIN)
     {"gdi-text-printing", flag_descriptions::kGdiTextPrinting,
      flag_descriptions::kGdiTextPrintingDescription, kOsWin,
      FEATURE_VALUE_TYPE(features::kGdiTextPrinting)},
     {"postscript-printing", flag_descriptions::kDisablePostscriptPrinting,
      flag_descriptions::kDisablePostscriptPrintingDescription, kOsWin,
      FEATURE_VALUE_TYPE(features::kDisablePostScriptPrinting)},
 #endif  // defined(OS_WIN)
 
 #if defined(OS_CHROMEOS)
-    {"show-arc-files-app", flag_descriptions::kShowArcFilesAppName,
-     flag_descriptions::kShowArcFilesAppDescription, kOsCrOS,
-     FEATURE_VALUE_TYPE(arc::kShowArcFilesAppFeature)},
-#endif // defined(OS_CHROMEOS)
-
-#if defined(OS_CHROMEOS)
     {"force-enable-stylus-tools",
      flag_descriptions::kForceEnableStylusToolsName,
      flag_descriptions::kForceEnableStylusToolsDescription, kOsCrOS,
      SINGLE_VALUE_TYPE(ash::switches::kAshForceEnableStylusTools)},
 #endif // defined(OS_CHROMEOS)
 
     {"enable-midi-manager-dynamic-instantiation",
      flag_descriptions::kEnableMidiManagerDynamicInstantiationName,
      flag_descriptions::kEnableMidiManagerDynamicInstantiationDescription,
      kOsAll,
@@ skipping 476 matching lines @@
 const base::HistogramBase::Sample kBadSwitchFormatHistogramId = 0;
 
 const FeatureEntry* GetFeatureEntries(size_t* count) {
   *count = arraysize(kFeatureEntries);
   return kFeatureEntries;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags