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https://www.w3.org/TR/css-values-4/#calc-type-checking spec
says that calc() function that resolve to <number> can be used
in any place that only accepts <integer>.
This change makes calc() function's behavior to comply with the spec.

Bug: 931216
Change-Id: Iac9ad21d664bb60538d40ab42cbb8153de6db89f
Reviewed-on: https://chromium-review.googlesource.com/c/1478852Reviewed-by: Anders Hartvoll Ruud <andruud@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Reviewed-by: Eric Willigers <ericwilligers@chromium.org>
Commit-Queue: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#634955}