cros: avoid SetFocusHighlightRect mojo calls when feature is not enabled

Bug: None
Change-Id: I0bf30291fce7f37aba0a8c3d087fe287d199a93d
Reviewed-on: https://chromium-review.googlesource.com/1018731
Reviewed-by: Daniel Cheng <[email protected]>
Reviewed-by: James Cook <[email protected]>
Commit-Queue: Qiang Xu <[email protected]>
Cr-Commit-Position: refs/heads/master@{#552050}
2 files changed