Adding Default Handlers from SpawnedTestServer to EmbeddedTestServer.

Implementing default handlers from SpawnedTestServer to allow us to
migrate more tests to EmbeddedTestServer.

BUG=492672
[email protected],[email protected]

Review URL: https://codereview.chromium.org/1406313002

Cr-Commit-Position: refs/heads/master@{#357162}
5 files changed