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Requests from the PDF viewer are not associated with a CefBrowser. Consequently, the InterceptedRequestHandler for those requests will register as an observer of CefContext destruction. When the browser is closed the InterceptedRequestHandler is destroyed and an async task is posted to remove/delete the observer on the UI thread. If CefShutdown is then called the task may execute after shutdown has started, in which case CONTEXT_STATE_VALID() will return false. We still need to remove the observer in this case to avoid a use-after-free in FinishShutdownOnUIThread.