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

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

R=reillyg@chromium.org

Change-Id: I2ec4c07a65a3452bc23982b31d5b0e8f08068838
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2435999
Auto-Submit: Kevin McNee <mcnee@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811321}