Nuke everything obsoleted by task snapshots

Test: go/wm-smoke
Change-Id: If9c9c2e66d97d6a5fa94d0d62ae7459fdde2a9a0
diff --git a/services/tests/servicestests/src/com/android/server/am/ActivityTestsBase.java b/services/tests/servicestests/src/com/android/server/am/ActivityTestsBase.java
index 55ecd7a..f3c00b1 100644
--- a/services/tests/servicestests/src/com/android/server/am/ActivityTestsBase.java
+++ b/services/tests/servicestests/src/com/android/server/am/ActivityTestsBase.java
@@ -117,7 +117,7 @@
         intent.setComponent(component);
 
         final TaskRecord task = new TaskRecord(service, 0, aInfo, intent /*intent*/,
-                null /*_taskDescription*/, new ActivityManager.TaskThumbnailInfo());
+                null /*_taskDescription*/);
         final ActivityStack stack = service.mStackSupervisor.getStack(stackId,
                 true /*createStaticStackIfNeeded*/, true /*onTop*/);
         service.mStackSupervisor.setFocusStackUnchecked("test", stack);