Reimplement QuicCryptoClientStream::WasChannelIDSent with a boolean

Reimplement QuicCryptoClientStream::WasChannelIDSent with a boolean
member so we can free channel_id_key_ after we're finished with it.

This fixes a TODO in https://codereview.chromium.org/355293003/.

R=rch@chromium.org
BUG=none

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=283569

[wtc, 2014-07-16 02:01:27]

https://codereview.chromium.org/397803004/diff/1/net/quic/quic_crypto_client_...
File net/quic/quic_crypto_client_stream.cc (right):

https://codereview.chromium.org/397803004/diff/1/net/quic/quic_crypto_client_...
net/quic/quic_crypto_client_stream.cc:194: channel_id_key_.get(),

If channel_id_key_.get() is not null, crypto_config_->FillClientHello will send
a ChannelID in the CHLO message.

[Ryan Hamilton, 2014-07-16 15:59:16]

lgtm

Nice cleanup!

[wtc, 2014-07-16 16:40:26]

The CQ bit was checked by wtc@chromium.org

[commit-bot: I haz the power, 2014-07-16 16:43:04]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/wtc@chromium.org/397803004/1

[commit-bot: I haz the power, 2014-07-16 23:18:00]

Change committed as 283569