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The [data_]deps of source_set dependencies aren't built.
The group target type works as I'd expect; see bug for details.

This is still a GN bug(?) workaround, but a cleaner one.

BUG=477104
TEST=Building mojo/services/html_viewer:apptest builds mojo_shell
R=sky@chromium.org

Review URL: https://codereview.chromium.org/1053493003

Cr-Commit-Position: refs/heads/master@{#325482}