Remove TaskRecordFactory.

Bug: 150409355
Test: Builds and boots.
Change-Id: I702d89c973001482ffcb3d26500c8ef477392c1e
diff --git a/services/core/java/com/android/server/wm/TaskDisplayArea.java b/services/core/java/com/android/server/wm/TaskDisplayArea.java
index 3dc6723..75295e6 100644
--- a/services/core/java/com/android/server/wm/TaskDisplayArea.java
+++ b/services/core/java/com/android/server/wm/TaskDisplayArea.java
@@ -959,7 +959,7 @@
             windowingMode = WINDOWING_MODE_UNDEFINED;
         }
 
-        final ActivityStack stack = (ActivityStack) Task.create(mAtmService, stackId, activityType,
+        final ActivityStack stack = new ActivityStack(mAtmService, stackId, activityType,
                 info, intent, createdByOrganizer);
         if (launchRootTask != null) {
             launchRootTask.addChild(stack, onTop ? POSITION_TOP : POSITION_BOTTOM);