cros: Enable AppSearchResultRanker by default.

The 10% stable experiment has shown 10% improvement.

Bug: 862413
Change-Id: I9c2422f8c19e0fb997160f49d822882b96f18aff
Reviewed-on: https://chromium-review.googlesource.com/c/1351337Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Charles . <charleszhao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613306}

ash/public/cpp/app_list/app_list_features.cc

@@ -35,7 +35,7 @@ const base::Feature kEnableZeroStateSuggestions{
 const base::Feature kEnableAppListSearchAutocomplete{
     "EnableAppListSearchAutocomplete", base::FEATURE_DISABLED_BY_DEFAULT};
 const base::Feature kEnableAppSearchResultRanker{
-    "EnableAppSearchResultRanker", base::FEATURE_DISABLED_BY_DEFAULT};
+    "EnableAppSearchResultRanker", base::FEATURE_ENABLED_BY_DEFAULT};
 
 bool IsAnswerCardEnabled() {
   // Not using local static variable to allow tests to change this value.