Fix non-functional nit in videoadapter
Fix non-functional nit in videoadapter

We should DCHECK alignment of width, not height.

BUG=None

Review-Url: https://codereview.webrtc.org/2726543002
Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#16904}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 4e836828f436082179e8d9a4fbf57b7a1a0a9a18

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