Mark http/tests/inspector/service-workers/user-agent-override.html as Timeout
Mark http/tests/inspector/service-workers/user-agent-override.html as Timeout

BUG=491764

Review URL: https://codereview.chromium.org/1164763003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@196397 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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