Vibration API: use the [Clamp] attribute.
Vibration API: use the [Clamp] attribute.

This makes it so that Javascript input of -1 is converted
to 0 rather than 4294967295.

BUG=310138

Review URL: https://codereview.chromium.org/30693008

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@160235 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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