Handle NaN in the Audio delay curves.

Since switching from std::min to clampTo NaN has caused ASSERTs.
This restores the old behaviour of no ASSERT and a delay interpreted
as maxDelayTime.

BUG=582699
R=rtoy@chromium.org

Review URL: https://codereview.chromium.org/1657763002

Cr-Commit-Position: refs/heads/master@{#372710}
1 file changed