Enable HideShelfControlsInTabletMode by default

Change-Id: Ib4559631453e2eec14345b9c9273d770b2eefb9c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2077118Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Toni Baržić <tbarzic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#745593}

ash/public/cpp/ash_features.cc

@@ -108,7 +108,7 @@ const base::Feature kDragFromShelfToHomeOrOverview{
     "DragFromShelfToHomeOrOverview", base::FEATURE_DISABLED_BY_DEFAULT};
 
 const base::Feature kHideShelfControlsInTabletMode{
-    "HideShelfControlsInTabletMode", base::FEATURE_DISABLED_BY_DEFAULT};
+    "HideShelfControlsInTabletMode", base::FEATURE_ENABLED_BY_DEFAULT};
 
 bool IsAllowAmbientEQEnabled() {
   return base::FeatureList::IsEnabled(kAllowAmbientEQ);