Switched Task to use WindowContainer

Bug: 30060889
Test: Manual testing and existing tests still pass.
Change-Id: Ia56767e47ad3df400e3aa2650f6386cca14659a7
diff --git a/services/core/java/com/android/server/wm/DisplayContent.java b/services/core/java/com/android/server/wm/DisplayContent.java
index ee73dee..979eb9d 100644
--- a/services/core/java/com/android/server/wm/DisplayContent.java
+++ b/services/core/java/com/android/server/wm/DisplayContent.java
@@ -371,7 +371,7 @@
         mStacks.add(addIndex, stack);
     }
 
-    // TODO: Don't forget to switch to WC.detachChild
+    // TODO: Don't forget to switch to WC.removeChild
     void detachChild(TaskStack stack) {
         detachStack(stack);
         if (stack.detachFromDisplay()) {