Revert "[CrOS] Disable new OOBE layout"

This reverts commit dd918e0.

Reason for revert: reenable the feature

Original change's description:
> [CrOS] Disable new OOBE layout
>
> Bug: 1135158
> Change-Id: I1ee549ff19f62a2679ad91795c881430dc5e9ccd
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2727642
> Reviewed-by: Roman Aleksandrov <raleksandrov@google.com>
> Commit-Queue: Roman Sorokin [CET] <rsorokin@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#859026}

Bug: 1135158
Change-Id: Iaba443bc20815fedb8842aa672515d00d76c7d62
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2747499
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Roman Sorokin [CET] <rsorokin@chromium.org>
Commit-Queue: Roman Aleksandrov <raleksandrov@google.com>
Auto-Submit: Roman Sorokin [CET] <rsorokin@chromium.org>
Reviewed-by: Roman Aleksandrov <raleksandrov@google.com>
Cr-Commit-Position: refs/heads/master@{#861550}

ash/constants/ash_features.cc

@@ -466,7 +466,7 @@ const base::Feature kMinimumChromeVersion{"MinimumChromeVersion",
 
 // Controls whether new OOBE layout is shown or not.
 const base::Feature kNewOobeLayout{"NewOobeLayout",
-                                   base::FEATURE_DISABLED_BY_DEFAULT};
+                                   base::FEATURE_ENABLED_BY_DEFAULT};
 
 // ChromeOS Media App. https://crbug.com/996088.
 const base::Feature kMediaApp{"MediaApp", base::FEATURE_ENABLED_BY_DEFAULT};