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When a client crash detected, the associated QuotaReservation object reclaims its reserved quota.
And then, in-flight operations should be ignored.

Review URL: https://codereview.chromium.org/139833006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@245481 0039d316-1c4b-4281-b951-d872f2087c98