cros: Enable AppList autocomplete by default

Approved by UX.

Bug: 877111
Change-Id: Ib890a03e22bbb017848cf413fbbc0e9e18a81e5d
Reviewed-on: https://chromium-review.googlesource.com/1196916Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Alex Newcomer <newcomer@chromium.org>
Commit-Queue: Daniel Zhang <oxyflush@google.com>
Cr-Commit-Position: refs/heads/master@{#589600}

ash/public/cpp/app_list/app_list_features.cc

@@ -34,7 +34,7 @@ const base::Feature kEnableContinueReading{"EnableContinueReading",
 const base::Feature kEnableZeroStateSuggestions{
     "EnableZeroStateSuggestions", base::FEATURE_DISABLED_BY_DEFAULT};
 const base::Feature kEnableAppListSearchAutocomplete{
-    "EnableAppListSearchAutocomplete", base::FEATURE_DISABLED_BY_DEFAULT};
+    "EnableAppListSearchAutocomplete", base::FEATURE_ENABLED_BY_DEFAULT};
 const base::Feature kEnableSearchResultRankerTrain{
     "EnableSearchResultRankerTrain", base::FEATURE_DISABLED_BY_DEFAULT};
 const base::Feature kEnableSearchResultRankerInfer{