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

components/arc/arc_features.cc

Index: components/arc/arc_features.cc
diff --git a/components/arc/arc_features.cc b/components/arc/arc_features.cc
index 66bf95a6d7d260b02724cdee653fd37c09ad8d20..fa8397d245c67d6e1230f1a3ab9e582ed7539ae6 100644
--- a/components/arc/arc_features.cc
+++ b/components/arc/arc_features.cc
@@ -17,9 +17,4 @@ const base::Feature kBootCompletedBroadcastFeature {
     "ArcBootCompletedBroadcast", base::FEATURE_ENABLED_BY_DEFAULT
 };
 
-// Controls whether we show ARC Files app in Chrome launcher.
-const base::Feature kShowArcFilesAppFeature {
-    "ShowArcFilesApp", base::FEATURE_DISABLED_BY_DEFAULT
-};
-
 }  // namespace arc