Pinned animation: Avoid expensive defensive programming.

Sys-trace revealed contention here as the overwhelming
cause of missed frames during the animation (typically contention
with relayout). The checks aren't necessary, and there is a visible
gain from removing the contention here.

Bug: 35396882
Test: Manual
Change-Id: I5151c603ac445c7832c9c499b663e5b9ec54e9f4

services/core/java/com/android/server/wm/TaskStack.java

@@ -1425,16 +1425,6 @@ public class TaskStack extends WindowContainer<Task> implements DimLayer.DimLaye
     }
 
     public boolean setPinnedStackSize(Rect bounds, Rect tempTaskBounds) {
-        synchronized (mService.mWindowMap) {
-            if (mDisplayContent == null) {
-                return false;
-            }
-            if (mStackId != PINNED_STACK_ID) {
-                Slog.w(TAG_WM, "Attempt to use pinned stack resize animation helper on"
-                        + "non pinned stack");
-                return false;
-            }
-        }
         try {
             mService.mActivityManager.resizePinnedStack(bounds, tempTaskBounds);
         } catch (RemoteException e) {