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Per device-id volume limits mean the content type exception is no longer
needed.
(https://chromium-review.googlesource.com/c/chromium/src/+/2071483)

Instead, the new focus type can be used to ensure the correct ducking
behavior:
(https://chromium-review.googlesource.com/c/chromium/src/+/2080583)

Bug: internal 144181483
Change-Id: I2ff83d18d142763f39ae6ea5ff0142b47142c9f1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2088836Reviewed-by: Kenneth MacKay <kmackay@chromium.org>
Commit-Queue: Kenneth MacKay <kmackay@chromium.org>
Auto-Submit: Adam Whiteside <awhiteside@google.com>
Cr-Commit-Position: refs/heads/master@{#747314}