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Changed NULL to nullptr where the presubmit complained (due to new line wrapping).

Generated by: https://chromium-review.googlesource.com/c/chromium/src/+/1689216

Bug: 981415
Tbr: gab@chromium.org
Change-Id: I9c7ea90816e2a2418981108f657bc52cee8c06ef
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1703541
Commit-Queue: Jeremy Roman <jbroman@chromium.org>
Reviewed-by: Jeremy Roman <jbroman@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#688514}