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Update code where NULL or 0 is assigned to a scoped_refptr to reset it. Just
call reset() instead. If operator=(std::nullptr_t) is added these assignments
become ambiguous.

This CL was uploaded by git cl split.

R=odejesush@chromium.org

Bug: 1024981
Change-Id: I24b8ae005c530c473b32745f398319db3fe39dcf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1918320
Auto-Submit: kylechar <kylechar@chromium.org>
Reviewed-by: Ovidio de Jesús Ruiz-Henríquez <odejesush@chromium.org>
Commit-Queue: kylechar <kylechar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715687}