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Quote form the presubmit checks of std::to_string [1]:
> std::to_string is locale dependent and slower than alternatives.  For
> locale-independent strings, e.g. writing numbers to and from disk
> profiles, use base::NumberToString().  For user-visible strings, use
> base::FormatNumber() and the related functions in
> base/i18n/number_formatting.h.

[1] https://cs.chromium.org/chromium/src/PRESUBMIT.py?l=719&rcl=fdd20c8546766e53c8369523080e79b9e60cac7b

Bug: None
Test: Passes capture_unittests.
Change-Id: Iaad9cfdedd5efb55c0a2f411ca505be127dedffa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1660389Reviewed-by: Wei Lee <wtlee@chromium.org>
Commit-Queue: Shik Chen <shik@chromium.org>
Cr-Commit-Position: refs/heads/master@{#669966}