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The RendererScheduler needs to be shutdown before the MessageLoop. Previously
this was the case as blink was shutdown before the message loop, however now
the message loop is shutdown first. This CL ensures that the renderer
scheduler is shutdown just before the message loop.

BUG=467369

Review URL: https://codereview.chromium.org/1014643002

Cr-Commit-Position: refs/heads/master@{#320908}