[WebUI][NTP] Enables the realbox on WebUI NTP

Bug: 1079040
Change-Id: I913f809e0906858cd925f38c628d99d0f7d6758c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2202504Reviewed-by: Tibor Goldschwendt <tiborg@chromium.org>
Commit-Queue: Moe Ahmadi <mahmadi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#769012}

chrome/browser/search/ntp_features.cc

@@ -52,7 +52,7 @@ const base::Feature kWebUI{"NtpWebUI", base::FEATURE_DISABLED_BY_DEFAULT};
 
 // If disabled, the realbox will not show on the WebUI new tab page.
 const base::Feature kWebUIRealbox{"WebUIRealbox",
-                                  base::FEATURE_DISABLED_BY_DEFAULT};
+                                  base::FEATURE_ENABLED_BY_DEFAULT};
 
 bool IsRealboxEnabled() {
   if (!base::FeatureList::IsEnabled(omnibox::kNewSearchFeatures))