[Chromecast] Don't run death tests when DCHECK is disabled
[Chromecast] Don't run death tests when DCHECK is disabled

BUG= internal b/27364008

Review URL: https://codereview.chromium.org/1740263003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#378114}

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