Enable kHelpAppV2 by default.

For M82.
Launch bug: https://crbug.com/1042109

Bug: 1012578
Change-Id: I76e80ed1f8afc5a34f76fbad30ebef731fd84ff0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2076738Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Commit-Queue: Rachel Carpenter <carpenterr@google.com>
Cr-Commit-Position: refs/heads/master@{#744935}

chromeos/constants/chromeos_features.cc

@@ -166,7 +166,7 @@ const base::Feature kGaiaActionButtons{"GaiaActionButtons",
                                        base::FEATURE_DISABLED_BY_DEFAULT};
 
 // The new ChromeOS Help App. https://crbug.com/1012578.
-const base::Feature kHelpAppV2{"HelpAppV2", base::FEATURE_DISABLED_BY_DEFAULT};
+const base::Feature kHelpAppV2{"HelpAppV2", base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Enable or disable Unified Input Logic for HMM decoder in the IME extension
 // on Chrome OS.