cast_test_utility needs a dependency on media_features
cast_test_utility needs a dependency on media_features

Some files in this target include a generated media_features.h header
indirectly through other media headers. So we need an explicit
dependency on the media_features target, to ensure the media_features.h
header is generated.

Review-Url: https://codereview.chromium.org/1969173002
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#393723}

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