[Files app] Enable flag rar2fs by default

Bug: 996549
Change-Id: I6c45c32116b2f7982f31837c9268253a69c7dd39
Cq-Depend: chromium:2061628, chromium:2059037
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2063512Reviewed-by: Anand Mistry <amistry@chromium.org>
Commit-Queue: François Degros <fdegros@chromium.org>
Cr-Commit-Position: refs/heads/master@{#744135}

chromeos/constants/chromeos_features.cc

@@ -220,7 +220,7 @@ const base::Feature kQuickAnswersRichUi{"QuickAnswersRichUi",
 
 // ChromeOS Files App mounts RAR archives via rar2fs instead of avfs.
 // https://crbug.com/996549
-const base::Feature kRar2Fs{"Rar2Fs", base::FEATURE_DISABLED_BY_DEFAULT};
+const base::Feature kRar2Fs{"Rar2Fs", base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Enables or disables Release Notes on Chrome OS.
 const base::Feature kReleaseNotes{"ReleaseNotes",