GitLab

Move skip expectations for manual tests to NeverFixTests.

This CL:

 - Moves about 80 [ Skip ] lines from TestExpectations into NeverFixTests.
 - Sorts the expectations lines for imported web-platform-tests.
 - Changes the comment at the top of NeverFixTests to suggest that the file
   can also be used for manual tests that we never want to run automatically.

Review-Url: https://codereview.chromium.org/2888543003
Cr-Commit-Position: refs/heads/master@{#472287}