Tests blocking requests with Fetch.failRequest.
Fetch.requestPaused: .../fetch/resources/Ahem.ttf
Fetch.requestPaused: .../fetch/resources/empty.html
Fetch.requestPaused: .../fetch/resources/hello-world.html
Fetch.requestPaused: .../fetch/resources/resource-cancel-test.html
Fetch.requestPaused: .../fetch/resources/test.jpg
Network.loadingFailed for .../fetch/resources/Ahem.ttf: blockedReason=inspector
Network.loadingFailed for .../fetch/resources/empty.html: blockedReason=inspector
Network.loadingFailed for .../fetch/resources/test.jpg: blockedReason=inspector
Navigation complete.