Enable kHelpAppV2 by default.

For M84.
Launch bug: https://crbug.com/1042109

Change-Id: I0a4f2533e9794b3190de9e0e360b2559d49212ba
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2148916Reviewed-by: dstockwell <dstockwell@chromium.org>
Commit-Queue: Rachel Carpenter <carpenterr@google.com>
Cr-Commit-Position: refs/heads/master@{#759079}

chromeos/constants/chromeos_features.cc

@@ -197,7 +197,7 @@ 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.