Reenable apps grid gap feature flag

Changes:
Renable the flag after bug 874619 is fixed.

Bug: 871448
Change-Id: I967e82ac1f34fd204dd561010cda5bd19d371cec
Reviewed-on: https://chromium-review.googlesource.com/1182671Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Weidong Guo <weidongg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584830}

ash/public/cpp/app_list/app_list_features.cc

@@ -23,8 +23,8 @@ const base::Feature kEnableHomeLauncher{"EnableHomeLauncher",
                                         base::FEATURE_ENABLED_BY_DEFAULT};
 const base::Feature kEnableSettingsShortcutSearch{
     "EnableSettingsShortcutSearch", base::FEATURE_DISABLED_BY_DEFAULT};
-const base::Feature kEnableAppsGridGapFeature{
-    "EnableAppsGridGapFeature", base::FEATURE_DISABLED_BY_DEFAULT};
+const base::Feature kEnableAppsGridGapFeature{"EnableAppsGridGapFeature",
+                                              base::FEATURE_ENABLED_BY_DEFAULT};
 const base::Feature kEnableNewStyleLauncher{"EnableNewStyleLauncher",
                                             base::FEATURE_ENABLED_BY_DEFAULT};
 const base::Feature kEnableContinueReading{"EnableContinueReading",