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std::function is banned by the style guide.

No behavior change intended.

Bug: 846327
Change-Id: I7bd3c0bf082147491e5784626a8f74beb1c06719
Reviewed-on: https://chromium-review.googlesource.com/1071517Reviewed-by: Max Morin <maxmorin@chromium.org>
Commit-Queue: Guido Urdaneta <guidou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#561527}