net/http: TestTransportCancelRequestInDial failing since CL 185117

[mvdan]

https://build.golang.org/log/57ed2a1981079dd230a61ecbec0e7bdfa1e04fb3

--- FAIL: TestTransportCancelRequestInDial (0.00s)
    transport_test.go:2295: Got events:
        dial: blocking
        canceling
        Get = Get "http://something.no-network.tld/": net/http: request canceled while waiting for connection
        
        Want:
        dial: blocking
        canceling
        Get = Get http://something.no-network.tld/: net/http: request canceled while waiting for connection
FAIL
FAIL	net/http	41.278s

[mvdan]

I have the (trivial) fix ready, but I'm running all tests to ensure no other failures remain.

[gopherbot]

Change https://golang.org/cl/192078 mentions this issue: net/http: fix a long test after CL 185117