[Chromecast] Fix build error from disable_display undefined
[Chromecast] Fix build error from disable_display undefined

Broken here:
https://codereview.chromium.org/1739353002/

BUG=

Review URL: https://codereview.chromium.org/1771843003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#379609}

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