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

/components/gcm_driver
This CL was uploaded by git cl split.

R=peter@chromium.org

Change-Id: I027ae7ed7eb22e989a0e5a759177b6808762bcf7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2435229
Auto-Submit: Kevin McNee <mcnee@chromium.org>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Commit-Queue: Peter Beverloo <peter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813700}