Bug 1078189 - Back out bug 1059023 for causing regression. r=dwilson, a=bajaj

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extra : rebase_source : 77a1fe19661d74088c46f343914609fd3ffd3996
Bug 1033335 - Don't send IDRs to change bitrates or periodic ones to fix encoder errors. r=pkerr, a=bajaj

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extra : rebase_source : eb1bf2d9404c19705645d66905cdb0379591e13e