Re-enable the unified media pipeline for JellyBean
Re-enable the unified media pipeline for JellyBean

The blocking bugs are fixed so we can turn it back on.

BUG=597467

Review-Url: https://codereview.chromium.org/1997483002
Cr-Commit-Position: refs/heads/master@{#395385}
(cherry picked from commit 1580687683f0814bfb8a6238b9b9243fff335ef9)

Review URL: https://codereview.chromium.org/2138233002 .

Cr-Commit-Position: 03d981dee550804c6934fd1a1d9cfa3c172affd3@{#610}
Cr-Branched-From: e9621a186760eb36d74098d9e33e4dd91c427b34@{#394939}

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