Remove navigation bar overlay flag.

Bug: b/174956354
Test: manual
Change-Id: I98e34b58071c5365b220bd3a81ab7af8109486f1
diff --git a/packages/SystemUI/res/values/flags.xml b/packages/SystemUI/res/values/flags.xml
index 52a97b1..2f3fbe7 100644
--- a/packages/SystemUI/res/values/flags.xml
+++ b/packages/SystemUI/res/values/flags.xml
@@ -45,8 +45,6 @@
 
     <bool name="flag_toast_style">false</bool>
 
-    <bool name="flag_navigation_bar_overlay">false</bool>
-
     <bool name="flag_pm_lite">false</bool>
 
     <bool name="flag_alarm_tile">false</bool>
diff --git a/packages/SystemUI/src/com/android/systemui/navigationbar/NavigationBarOverlayController.java b/packages/SystemUI/src/com/android/systemui/navigationbar/NavigationBarOverlayController.java
index 62b9458..2d0d5cd 100644
--- a/packages/SystemUI/src/com/android/systemui/navigationbar/NavigationBarOverlayController.java
+++ b/packages/SystemUI/src/com/android/systemui/navigationbar/NavigationBarOverlayController.java
@@ -21,7 +21,6 @@
 import android.view.View;
 
 import com.android.systemui.dagger.SysUISingleton;
-import com.android.systemui.statusbar.FeatureFlags;
 
 import java.util.function.Consumer;
 
@@ -32,12 +31,10 @@
 public class NavigationBarOverlayController {
 
     protected final Context mContext;
-    protected final FeatureFlags mFeatureFlags;
 
     @Inject
-    public NavigationBarOverlayController(Context context, FeatureFlags featureFlags) {
+    public NavigationBarOverlayController(Context context) {
         mContext = context;
-        mFeatureFlags = featureFlags;
     }
 
     public Context getContext() {
@@ -45,7 +42,7 @@
     }
 
     public boolean isNavigationBarOverlayEnabled() {
-        return mFeatureFlags.isNavigationBarOverlayEnabled();
+        return false;
     }
 
     /**
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/FeatureFlags.java b/packages/SystemUI/src/com/android/systemui/statusbar/FeatureFlags.java
index 708bdfe..90c3dfc 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/FeatureFlags.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/FeatureFlags.java
@@ -87,10 +87,6 @@
         return mFlagReader.isEnabled(R.bool.flag_wallet);
     }
 
-    public boolean isNavigationBarOverlayEnabled() {
-        return mFlagReader.isEnabled(R.bool.flag_navigation_bar_overlay);
-    }
-
     public boolean isPMLiteEnabled() {
         return mFlagReader.isEnabled(R.bool.flag_pm_lite);
     }