Back out "Track animations and flush them"

Summary:
Original commit changeset: b594d0e6e9b6

D20319824 introduced a problem in LayoutAnimations, which makes surfaced as the problem in T63911344. This diff reverts D20319824.

Changelog: [Internal]

Reviewed By: lunaleaps

Differential Revision: D20541918

fbshipit-source-id: ff72b839f57d39051122920a38b2632cbb5ec362

ReactAndroid/src/main/java/com/facebook/react/uimanager/NativeViewHierarchyManager.java

@@ -366,8 +366,6 @@ public class NativeViewHierarchyManager {
     UiThreadUtil.assertOnUiThread();
 
     final Set<Integer> pendingDeletionTags = new HashSet<>();
-    mLayoutAnimator.cancelAnimationsForViewTag(tag);
-
     final ViewGroup viewToManage = (ViewGroup) mTagsToViews.get(tag);
     final ViewGroupManager viewManager = (ViewGroupManager) resolveViewManager(tag);
     if (viewToManage == null) {
@@ -451,7 +449,6 @@ public class NativeViewHierarchyManager {
         if (mLayoutAnimationEnabled && mLayoutAnimator.shouldAnimateLayout(viewToDestroy)) {
           pendingDeletionTags.add(tagToDelete);
           mLayoutAnimator.deleteView(
-              tag,
               viewToDestroy,
               new LayoutAnimationListener() {
                 @Override