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This also update test expectation linter to error out on lines with mutual
exclusive specifiers

The Expectation files are updated using the script in https://chromium-review.googlesource.com/c/chromium/src/+/1336387

This is the first part of the plan to migrate WebkitLayout test expectations to the new format.

Bug: 807751
Change-Id: Iad2296a99804fb16d9b474229b68c0d47d3fe1eb
Reviewed-on: https://chromium-review.googlesource.com/c/1336439
Commit-Queue: Ned Nguyen <nednguyen@google.com>
Reviewed-by: Robert Ma <robertma@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610468}