Test using a deprecated feature

Pseudo has been removed from the spec. These tests are obsolete.
Delete tests better handled in Aryeh's tests and other tests
delete tests better handled in /html/dom/interfaces.html
Rewrite infraware tests on appcache
Updated distributed to content
Merge remote-tracking branch 'upstream/master' into infraware-forms
revert tests per https://critic.hoppipolla.co.uk/r/738
Fixed wrong expectation and added a counterpoint

In this case the shadow content should not be rendered. Also added a
counterpoint case.
tests for document.{cookie,lastModified,readyState}
set Last-Modified to a specific date and test a specific expected string instead of format
add use case when Last-Modified header is missing
use currentState instead of string
test value when DOMContentLoaded event is fired
call abort() from loadstart, otherwise test is invalid
minor bug fix
improved test coverage of abort() algorithm 4.3 and 5
call abort() from loadstart to avoid send() throwing (bugfix, test was broken)
dropping invalid tests for data: and about:blank, adding a data: URL that won't parse
status 501 is wrong for data: URLs after POST request
Assert that HTML documents must be sent as text/html and XML as application/xml when serialized by the send() method
Rework encoding part in send-document test, test three documents with various encodings/validity/content-type combinations