Enable the AppService context menu integration feature.

BUG=1038487

Change-Id: I067e0e6be20415b17cba391c1bef4c4175a58c07
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2035639Reviewed-by: Jeevan Shikaram <jshikaram@chromium.org>
Commit-Queue: Nancy Wang <nancylingwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738069}

chrome/common/chrome_features.cc

@@ -67,7 +67,7 @@ const base::Feature kAppNotificationStatusMessaging{
 #if !defined(OS_ANDROID)
 // App Service related flags. See chrome/services/app_service/README.md.
 const base::Feature kAppServiceContextMenu{"AppServiceContextMenu",
-                                           base::FEATURE_DISABLED_BY_DEFAULT};
+                                           base::FEATURE_ENABLED_BY_DEFAULT};
 const base::Feature kAppServiceInstanceRegistry{
     "AppServiceInstanceRegistry", base::FEATURE_ENABLED_BY_DEFAULT};
 const base::Feature kAppServiceIntentHandling{