Use clampTo<int> in SVGInteger::CalculateAnimatedValue

Matches what we do in SVGIntegerOptionalInteger::CalculateAnimatedValue,
and avoids undefined overflow.

Bug: 899445
Change-Id: I1250a05482713780f707301ed29e015fd81e65f2
Reviewed-on: https://chromium-review.googlesource.com/c/1304483
Reviewed-by: Stephen Chenney <schenney@chromium.org>
Commit-Queue: Fredrik Söderquist <fs@opera.com>
Cr-Commit-Position: refs/heads/master@{#603548}
1 file changed