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In the current code, CPU adaptation does not work correctly. It should
scale to the adapted resolution, but it crops instead. The result looks
like zoomed in video. This bug was introduced in
https://codereview.chromium.org/2270723002/.

This CL fixes the cropping logic.

BUG=chromium:635592

Review-Url: https://codereview.chromium.org/2323573004
Cr-Commit-Position: refs/heads/master@{#417549}