Enable KioskNextShell flag by default.

Bug: 927809
Change-Id: Ibd37e6fe3ec7fc43b1ae72d3d52e695b7fd865f3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1641991
Commit-Queue: Bruno Santos <brunoad@chromium.org>
Commit-Queue: Michael Giuffrida <michaelpg@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Auto-Submit: Bruno Santos <brunoad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#665683}

ash/public/cpp/ash_features.cc

@@ -56,7 +56,7 @@ const base::Feature kUnlockWithExternalBinary{
     "UnlockWithExternalBinary", base::FEATURE_DISABLED_BY_DEFAULT};
 
 const base::Feature kKioskNextShell{"KioskNextShell",
-                                    base::FEATURE_DISABLED_BY_DEFAULT};
+                                    base::FEATURE_ENABLED_BY_DEFAULT};
 
 const base::Feature kViewsLogin{"ViewsLogin", base::FEATURE_ENABLED_BY_DEFAULT};