Revert^2 "Set Change::Metadata on LayerMetadata update"

This reverts commit 10fbacda6dc007baca753d19ccfd148cd8a8eab9.

Reason for revert: Change::Metadata no longer sent on BLAST dequeueTime update ag/27478127

Change-Id: I9889ac6cfcd03103fcc9ede13f4b05a3bf8fcdb3
4 files changed