[Overview actions] Remove unused duration variable.

Test: local build
Change-Id: I2f18e77273753f491c6d802aa3b4406fefce6ad7
diff --git a/quickstep/recents_ui_overrides/src/com/android/quickstep/views/OverviewActionsView.java b/quickstep/recents_ui_overrides/src/com/android/quickstep/views/OverviewActionsView.java
index ea33d00..83287c4 100644
--- a/quickstep/recents_ui_overrides/src/com/android/quickstep/views/OverviewActionsView.java
+++ b/quickstep/recents_ui_overrides/src/com/android/quickstep/views/OverviewActionsView.java
@@ -45,8 +45,6 @@
 public class OverviewActionsView<T extends OverlayUICallbacks> extends FrameLayout
         implements OnClickListener {
 
-    public static final long VISIBILITY_TRANSITION_DURATION_MS = 80;
-
     @IntDef(flag = true, value = {
             HIDDEN_UNSUPPORTED_NAVIGATION,
             HIDDEN_DISABLED_FEATURE,