API test WKWebView.DefaultNavigationDelegate timing out https://build.webkit.org/builders/Apple%20El%20Capitan%20Release%20WK1%20%28Tests%29/builds/9399/steps/run-api-tests/logs/stdio
Started between r205362 and r205366
Reproduces on Sierra, El Capitan, Yosemite
Probably https://trac.webkit.org/changeset/205365/trunk/Source/WebKit2/UIProcess/API/Cocoa/WKWebView.mm
Committed r205371: https://trac.webkit.org/changeset/205371