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If seek happens while requesting data for the inactive chunk, the ack for the data request will call OnDecodeCompleted().
However, the decoder job is waiting for the OnDecodeCompleted() from the active chunk.
Tests:We already have seveal tests covering requesting inactive chunk during seek. This CL should fix the flakiness in there.

BUG=361541

Review URL: https://codereview.chromium.org/227523005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@262934 0039d316-1c4b-4281-b951-d872f2087c98