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Use OnceCallback where possible, and BindRepeating where it is
meant to be called more than once.

These are the last instances in //content/renderer/ entirely.

R=liberato@chromium.org
TBR=dpranke

Bug: 953861
Change-Id: Ib32ab468dcdf835e4b8fa08c19cf569a03a50144
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1934833Reviewed-by: danakj <danakj@chromium.org>
Reviewed-by: Frank Liberato <liberato@chromium.org>
Commit-Queue: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#719228}