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set up a timer to cancel any requests, if the handshake takes too long.
The requests will be retried and will use either QUIC or TCP, whichever
connects first.

Review URL: https://codereview.chromium.org/318993004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@275552 0039d316-1c4b-4281-b951-d872f2087c98