Re-enable DefaultPinnedAppsUpdate2021Q2 default shelf app ordering

This feature is targeting M92 to coincide with the rollout of migrating
default Chrome apps to web apps.

Bug: 1193383
Change-Id: Ib4fffa1c373134c9eb92855455980030a563680b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2896211
Auto-Submit: Alan Cutter <alancutter@chromium.org>
Commit-Queue: Eric Willigers <ericwilligers@chromium.org>
Reviewed-by: Eric Willigers <ericwilligers@chromium.org>
Cr-Commit-Position: refs/heads/master@{#882948}

chrome/common/chrome_features.cc

@@ -238,7 +238,7 @@ const base::Feature kPreinstalledWebAppInstallation{
 // Updates the default set of pinned apps in the Chrome OS shelf for new
 // profiles.
 const base::Feature kDefaultPinnedAppsUpdate2021Q2{
-    "DefaultPinnedAppsUpdate2021Q2", base::FEATURE_DISABLED_BY_DEFAULT};
+    "DefaultPinnedAppsUpdate2021Q2", base::FEATURE_ENABLED_BY_DEFAULT};
 #endif
 
 // Enable using tab sharing infobars for desktop capture.