Fix NPE on ActivityWindowInfo

The issue happens because the ActivityWindowInfo update in window
relayout is guarded with flag, which cause the device without the flag
updating to null.

Fix the issue by removing the flag check, and also make the varible non
null.

Fix: 331051007
Test: pass failure tests
Change-Id: Iaead41317f734fa1638c830b09659df482ed3a87
2 files changed