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This is a precursor to adding a new scoped_refptr(std::nullptr_t)
constructor. The implicit conversion from NULL to scoped_refptr<T>
causes a compilation error with the new constructor. Replace NULL with
nullptr in any files where this is a problem.

This CL was uploaded by git cl split.

R=seantopping@chromium.org

Bug: 1018887
Change-Id: I379afddc4e505e5d2260e3ec076cf19ed1ff46ce
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1885076
Auto-Submit: kylechar <kylechar@chromium.org>
Reviewed-by: Sean Topping <seantopping@chromium.org>
Commit-Queue: kylechar <kylechar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710167}