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static_cast is better suited for downcasting since it can check that the
types are related.

/content/browser/media
This CL was uploaded by git cl split.

R=sandersd@chromium.org

Change-Id: I324ae893245bbd253e68e9e2d7b31fe0c62ccb87
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2434909
Auto-Submit: Kevin McNee <mcnee@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Commit-Queue: Dan Sanders <sandersd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811350}