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The number of missing packets between the current received packet and the
previously largest received packet sequence number, when the current
received packet had a lower sequence number than the previously received
packet sequence number.

Review URL: https://chromiumcodereview.appspot.com/23451015

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@221955 0039d316-1c4b-4281-b951-d872f2087c98