QUIC - use QuicSessionKey tuple (host, port, is_https) instead of
server_hostname, while creating QuicClientSession,
QuicCryptoClientStream, QuicCryptoClientConfig, etc objects.
QuicSessionKey is used as the key to access QUIC server
config information from all caches (disk and memory caches).
On Disk cache, the key for accessing QUIC server information is the
flattened version (scheme://hostname:port) of QuicSession.
scheme would be either http or https until we support other schemes.
R=rch@chromium.org, wtc@chromium.org
Review URL: https://codereview.chromium.org/
192583004
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@257272 0039d316-1c4b-4281-b951-d872f2087c98