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asynchronous implementation.

Current ChannelIDSource implementations work in synchronous mode. So
QuicCryptoClientStream still calls ChannelIDSource::GetChannelIDKey() as
a synchronous function. In a future CL, QuicCryptoClientStream will properly
call ChannelIDSource::GetChannelIDKey() as an asynchronous function.

Note that ChannelIDSourceForTesting() returns a ChannelIDSource that works
in synchronous mode.

Merge internal CL: 68399207

R=rch@chromium.org,rtenneti@chromium.org
BUG=none

Review URL: https://codereview.chromium.org/320663002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@275634 0039d316-1c4b-4281-b951-d872f2087c98