Add SpdyNetworkTransactionTest.HTTP11RequiredError.
Add SpdyNetworkTransactionTest.HTTP11RequiredError.

SpdyNetworkTransactionTest.HTTP11RequiredError was removed from
https://crrev.com/852053002 in patch set 20, because it crashed on
win_chromium_rel_ng testbot, but we didn't understand why.  Then a dangling
reference bug was fixed in https://crrev.com/753583003.  Said test does not
crash any more, so it should be added.

Thanks rch@ for pointing this out at https://codereview.chromium.org/852053002#msg8.

BUG=431306

Review URL: https://codereview.chromium.org/853213002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#312249}

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