Initial TestExpectations vs. WPTServeExpectations cleanup

Now that --enable-wptserve is on by default we don't need
an override expectations file.

BUG=666111
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Review-Url: https://codereview.chromium.org/2509753003
Cr-Commit-Position: refs/heads/master@{#433041}
48 files changed