Update web-platform-tests expectations.

[Ms2ger]

The first 11 tests in Event-constructors.html were fixed in #2194; the
remaining failure is #2173. Node-normalize.html was fixed in #2221.

[hoppipolla-critic-bot]

Critic review: https://critic.hoppipolla.co.uk/r/1442

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In order to help critic track your changes, please do not make in-place history rewrites (e.g. via git rebase -i or git commit --amend) when updating this pull request.

[jdm]

r+

[bors-servo]

saw approval from jdm
at Ms2ger@0a47659

[bors-servo]

merging Ms2ger/servo/update-wpt = 0a47659 into auto

[bors-servo]

Ms2ger/servo/update-wpt = 0a47659 merged ok, testing candidate = 9b6b552

[bors-servo]

all tests pass:
success: http://servo-buildbot.pub.build.mozilla.org/builders/linux/builds/1313
success: http://servo-buildbot.pub.build.mozilla.org/builders/mac/builds/1267

[bors-servo]

fast-forwarding master to auto = 9b6b552