With the GOAWAY code we now can have a case where we attempt to remove the session from the pool twice.  Recover, instead of abort, on that case.
With the GOAWAY code we now can have a case where we attempt
to remove the session from the pool twice.  Recover, instead of
abort, on that case.

Caught by existing test case already.

TBR=willchan
BUG=none
TEST=SpdyNetworkTransactionTest.GoAwayWithActiveStream


git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@45211 0039d316-1c4b-4281-b951-d872f2087c98

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