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As per the specification, https://html.spec.whatwg.org/#the-htmloptionscollection-interface,
there is no exception throwing mechanism defined when negative values are passed. In such case
we should just ignore the values and avoid using the custom binding for such usage.

Trying to set any value greater than 10000 will be ignored with the existing
length unchanged.

BUG=345519

R=haraken@chromium.org

Review URL: https://codereview.chromium.org/1292653003

git-svn-id: svn://svn.chromium.org/blink/trunk@200819 bbb929c8-8fbe-4397-9dbb-9b2b20218538