This CL should remove support for linux-precise port, although it doesn't yet remove all instances of the string "precise", which also occur in various tests. A possible follow-up would be to update these tests to not use the string "precise".

This CL also removes all lines that were marked as Skip for Precise, and updates baselines for those tests.

BUG=660580

Review-Url: https://codereview.chromium.org/2514253002
Cr-Commit-Position: refs/heads/master@{#434000}