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kinuko@chromium.org authored
This fixes two possible crash: 1. document->frame() could be null when ServiceWorkerContainerClient::from is called 2. NavigatorServiceWorker.m_serviceWorker could be null in ServiceWorkerContainer::detachClient BUG=355998,356017 TEST=fast/serviceworker/access-container-with-invalid-context.html Review URL: https://codereview.chromium.org/217023003 git-svn-id: svn://svn.chromium.org/blink/trunk@170501 bbb929c8-8fbe-4397-9dbb-9b2b20218538
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