[flexiglass] Verify that NSSL#mContentHeight is not accessed

NSSL#mContentHeight is replaced by ScrollViewFields#.intrinsicStackHeight when flexiglass is enabled.

Bug: 296118689
Test: run sysui with, and without flexiglass
Flag: EXEMPT mechanical refactor
Change-Id: I6e15cd9a703f76406c86ac77a331ff7cad5ac435
2 files changed