Gardening: Mark http/tests/inspector/service-workers/user-agent-override.html as flaky
Gardening: Mark http/tests/inspector/service-workers/user-agent-override.html as flaky

BUG=473633
TBR=junov@chromium.org

Review URL: https://codereview.chromium.org/1052363003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@193110 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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