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The Google style guide states that only one of {virtual,override,final}
should be used for each declaration, since override implies virtual and
final implies both virtual and override.

This patch was automatically generated with an OS=android build using a
variation of https://codereview.chromium.org/598073004.

BUG=417463
R=caitkp@chromium.org

Review URL: https://codereview.chromium.org/893303003

Cr-Commit-Position: refs/heads/master@{#314677}