Add a test for Blob.close.
Missing .length causing the test to fail

Added the .length attribute to fix a failing test in Shadow DOM's
csshostrule-attributes test.
Merge pull request #576 from KenjiBaheux/master

Missing .length causing the test to fail
Convert files with mostly LF line endings to pure LF
Convert files with mostly CRLF line endings to pure CRLF

This in order to make a full CRLF -> LF conversion easier to verify.
Convert files with only CRLF line endings to pure LF

WebIDL/tests/submissions/W3C/valid/idl/documentation-dos.widl was
left as CRLF because the name makes it look intentional.

3 files with mixed line endings remain:

cors/resources/cors-headers.asis
html/semantics/embedded-content-0/the-canvas-element/size.attributes.parse.whitespace.html
old-tests/submission/Opera/media/track/webvtt/parsing/support/newlines.vtt

To verify that this commit makes no other changes:

$ git diff --name-only HEAD^ | xargs unix2dos
$ git diff HEAD^ # should show nothing
Merge pull request #545 from Ms2ger/Blob-close

Add a test for Blob.close.