Clarify guidance for when to use histogram functions vs macros.

Given that the overhead of dynamic histogram lookup is insignificant in
most cases, encourage the use of functions over macros and remove the
very specific reference to "ten calls per hour".

Bug: 1047547
Change-Id: I334e1d3cca240c4d5bbae0865cfda8403e507c14
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2040006
Auto-Submit: Daniel Cheng <[email protected]>
Commit-Queue: Alexei Svitkine <[email protected]>
Reviewed-by: Alexei Svitkine <[email protected]>
Cr-Commit-Position: refs/heads/master@{#738978}
1 file changed