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SpdyFramer will accept them, and frame them if present. We may want to leave this for later SPDY versions, but certainly don't emit them in SPDY4.

BUG=345769

Review URL: https://codereview.chromium.org/316983006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@275512 0039d316-1c4b-4281-b951-d872f2087c98