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The rv == 1 case was getting a little unwieldy. This should hopefully be
simpler. DoHandshake converts the error to a net error code and decides which
state to transition to. DoHandshakeComplete handles the result of the
handshake.

BUG=none

Review URL: https://codereview.chromium.org/1126113004

Cr-Commit-Position: refs/heads/master@{#329518}