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This is a class to handle the session handshake logic as well as encryption with
session key. The stub implementation for session type "empty" does nothing and
passes the data unencrypted.

BUG=380795

Review URL: https://codereview.chromium.org/316873004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@275635 0039d316-1c4b-4281-b951-d872f2087c98