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This meta-target had a couple of transitive dependencies on dawn,
despite dawn not being available on cros. This change makes those
dependencies conditional on `use_dawn`.

Bug: None
Change-Id: I630e8786ab21510a2caee54a85034591a215981a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1917380Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715328}