diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/CentralSurfaces.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/CentralSurfaces.java
index e23ac7d352ac9..226df76a452a0 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/CentralSurfaces.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/CentralSurfaces.java
@@ -31,7 +31,6 @@ import android.view.KeyEvent;
 import android.view.MotionEvent;
 import android.view.RemoteAnimationAdapter;
 import android.view.View;
-import android.view.ViewGroup;
 import android.window.RemoteTransition;
 import android.window.SplashScreen;
 
@@ -40,7 +39,6 @@ import androidx.lifecycle.Lifecycle;
 import androidx.lifecycle.LifecycleOwner;
 
 import com.android.internal.annotations.VisibleForTesting;
-import com.android.internal.statusbar.RegisterStatusBarResult;
 import com.android.keyguard.AuthKeyguardMessageArea;
 import com.android.systemui.Dumpable;
 import com.android.systemui.animation.ActivityLaunchAnimator;
@@ -52,7 +50,6 @@ import com.android.systemui.shade.NotificationShadeWindowView;
 import com.android.systemui.shade.NotificationShadeWindowViewController;
 import com.android.systemui.shade.ShadeViewController;
 import com.android.systemui.shared.system.RemoteAnimationRunnerCompat;
-import com.android.systemui.statusbar.LightRevealScrim;
 import com.android.systemui.statusbar.NotificationPresenter;
 import com.android.systemui.statusbar.notification.row.ExpandableNotificationRow;
 import com.android.systemui.util.Compile;
@@ -70,14 +67,11 @@ public interface CentralSurfaces extends Dumpable, LifecycleOwner {
     String TAG = "CentralSurfaces";
     boolean DEBUG = false;
     boolean SPEW = false;
-    boolean DUMPTRUCK = true; // extra dumpsys info
     boolean DEBUG_GESTURES = false;
     boolean DEBUG_MEDIA_FAKE_ARTWORK = false;
     boolean DEBUG_CAMERA_LIFT = false;
     boolean DEBUG_WINDOW_STATE = false;
     boolean DEBUG_WAKEUP_DELAY = Compile.IS_DEBUG;
-    // additional instrumentation for testing purposes; intended to be left on during development
-    boolean CHATTY = DEBUG;
     boolean SHOW_LOCKSCREEN_MEDIA_ARTWORK = true;
     String ACTION_FAKE_ARTWORK = "fake_artwork";
     int FADE_KEYGUARD_START_DELAY = 100;
@@ -240,8 +234,6 @@ public interface CentralSurfaces extends Dumpable, LifecycleOwner {
 
     void onKeyguardViewManagerStatesUpdated();
 
-    ViewGroup getNotificationScrollLayout();
-
     boolean isPulsing();
 
     boolean isOccluded();
@@ -303,8 +295,6 @@ public interface CentralSurfaces extends Dumpable, LifecycleOwner {
     @Override
     void dump(PrintWriter pwOriginal, String[] args);
 
-    void createAndAddWindows(@Nullable RegisterStatusBarResult result);
-
     float getDisplayWidth();
 
     float getDisplayHeight();
@@ -354,8 +344,6 @@ public interface CentralSurfaces extends Dumpable, LifecycleOwner {
     void showBouncerWithDimissAndCancelIfKeyguard(OnDismissAction performAction,
             Runnable cancelAction);
 
-    LightRevealScrim getLightRevealScrim();
-
     // TODO: Figure out way to remove these.
     NavigationBarView getNavigationBarView();
 
@@ -469,8 +457,6 @@ public interface CentralSurfaces extends Dumpable, LifecycleOwner {
 
     void extendDozePulse();
 
-    boolean shouldDelayWakeUpAnimation();
-
     public static class KeyboardShortcutsMessage {
         final int mDeviceId;
 
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/CentralSurfacesImpl.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/CentralSurfacesImpl.java
index 8f3616bea5ee3..53c40b83e7e32 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/CentralSurfacesImpl.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/CentralSurfacesImpl.java
@@ -1828,11 +1828,6 @@ public class CentralSurfacesImpl implements CoreStartable, CentralSurfaces {
         logStateToEventlog();
     }
 
-    @Override
-    public ViewGroup getNotificationScrollLayout() {
-        return mStackScroller;
-    }
-
     @Override
     public boolean isPulsing() {
         return mDozeServiceHost.isPulsing();
@@ -2257,8 +2252,7 @@ public class CentralSurfacesImpl implements CoreStartable, CentralSurfaces {
                 + CameraIntents.getOverrideCameraPackage(mContext));
     }
 
-    @Override
-    public void createAndAddWindows(@Nullable RegisterStatusBarResult result) {
+    private void createAndAddWindows(@Nullable RegisterStatusBarResult result) {
         makeStatusBarView(result);
         mNotificationShadeWindowController.attach();
         mStatusBarWindowController.attach();
@@ -3044,11 +3038,6 @@ public class CentralSurfacesImpl implements CoreStartable, CentralSurfaces {
         }
     }
 
-    @Override
-    public LightRevealScrim getLightRevealScrim() {
-        return mLightRevealScrim;
-    }
-
     // TODO: Figure out way to remove these.
     @Override
     public NavigationBarView getNavigationBarView() {