Remove references to FEATURE_PC and related Desktop classes in Launcher

Also clean up TaskbarRecentAppsController APIs

Flag: NA
Test: DesktopTaskbarRunningAppsControllerTest
Bug: 330551930
Change-Id: Ibd9c3d6aa1d5423b51a48ed0a972196752d5199a

quickstep/src/com/android/launcher3/taskbar/TaskbarRecentAppsController.java

@@ -17,9 +17,8 @@ package com.android.launcher3.taskbar;
 
 import static java.util.Collections.emptySet;
 
-import android.util.SparseArray;
-
 import androidx.annotation.CallSuper;
+import androidx.annotation.NonNull;
 
 import com.android.launcher3.model.data.AppInfo;
 import com.android.launcher3.model.data.ItemInfo;
@@ -59,13 +58,12 @@ public class TaskbarRecentAppsController {
     }
 
     /** Called to update hotseatItems, no-op except in desktop environment. */
-    protected ItemInfo[] updateHotseatItemInfos(ItemInfo[] hotseatItems) {
+    protected ItemInfo[] updateHotseatItemInfos(@NonNull ItemInfo[] hotseatItems) {
         return hotseatItems;
     }
 
     /** Called to update the list of currently running apps, no-op except in desktop environment. */
-    protected void updateRunningApps(SparseArray<ItemInfo> hotseatItems) {
-    }
+    protected void updateRunningApps() {}
 
     /** Returns the currently running apps, or an empty Set if outside of Desktop environment. */
     public Set<String> getRunningApps() {