Files App: Enable flag files-zip-mount by default

This allows to use the new ZIP mounter in ChromeOS Files App by default.

BUG=chromium:912236

Change-Id: Idc907993df3e2e984d8b5d580eb34be1fb88c637
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2449853Reviewed-by: Jeremie Boulic <jboulic@chromium.org>
Commit-Queue: François Degros <fdegros@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814439}

chromeos/constants/chromeos_features.cc

@@ -281,7 +281,7 @@ const base::Feature kFiltersInRecents{"FiltersInRecents",
 // Enables new ZIP archive handling in Files App.
 // https://crbug.com/912236
 const base::Feature kFilesZipMount{"FilesZipMount",
-                                   base::FEATURE_DISABLED_BY_DEFAULT};
+                                   base::FEATURE_ENABLED_BY_DEFAULT};
 const base::Feature kFilesZipPack{"FilesZipPack",
                                   base::FEATURE_DISABLED_BY_DEFAULT};
 const base::Feature kFilesZipUnpack{"FilesZipUnpack",