Elliott Sprehn b9aaf7d8e2 Clean up child checks in ContainerNode.
We can simplify the checks given that there's fewer node types now. This does
make the error messages from Range a little worse, but it's weird that Range
is doing its own error checking anyway.

I also took this as an opportunity to add a bunch of DOM tests.

R=ojan@chromium.org

Review URL: https://codereview.chromium.org/732203004
2014-11-18 16:49:48 -08:00
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