Removing test_server() and switching over to embedded_test_server.

This removes the last uses of test_server() and switches to using
embedded_test_server/spawned_test_server.

BUG=492672,96594

Review URL: https://codereview.chromium.org/1486633002

Cr-Commit-Position: refs/heads/master@{#363057}
9 files changed