Re: [w3c/selection-api] collapse and setBaseAndExtent methods contain redundant checks of offset (#124)

The [WPT tests for collapse and setPosition](https://github.com/web-platform-tests/wpt/blob/master/selection/collapse.js) expect the `IndexSizeError` check to be done before the `document.contains` check. The [WPT test for setBaseAndExtent](https://github.com/web-platform-tests/wpt/blob/master/selection/setBaseAndExtent.html) is does not cover the case where there is both `IndexSizeError` and a `document.contains` violation and so does not detect if the check is done before or after the `document.contains` check.

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