GitLab

https://google.github.io/styleguide/cppguide.html#0_and_nullptr/NULL
says:
"For pointers (address values), use nullptr, as this provides
type-safety."

Furthermore, NULL/0 won't compile if we change |SomeClass*| to
|CheckedPtr<SomeClass>|. See go/miracleptr for project details.

Bug: 1080832
Change-Id: I00908679918e2c2316b25d9fd834914e540bd163
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2512484Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Kentaro Hara <haraken@chromium.org>
Auto-Submit: Bartek Nowierski <bartekn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822946}