Enable AppService integration in shelf.

BUG=998004

Change-Id: I3bccc70e1a2d372585bf015ebc0b808b43b4be85
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1787618Reviewed-by: Nigel Tao <nigeltao@chromium.org>
Commit-Queue: Nancy Wang <nancylingwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695541}

chrome/common/chrome_features.cc

@@ -68,7 +68,7 @@ const base::Feature kAppServiceAsh{"AppServiceAsh",
 const base::Feature kAppServiceIntentHandling{
     "AppServiceIntentHandling", base::FEATURE_DISABLED_BY_DEFAULT};
 const base::Feature kAppServiceShelf{"AppServiceShelf",
-                                     base::FEATURE_DISABLED_BY_DEFAULT};
+                                     base::FEATURE_ENABLED_BY_DEFAULT};
 #endif  // !defined(OS_ANDROID)
 
 // Enables the built-in DNS resolver.