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In chromium code audio_utility.cc we just need to use PI constant from
//base instead from local file.
This is some polishing.

Change-Id: I71d7042a9ed40c563c67bab2237b267c822a6961
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2027367Reviewed-by: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Yuri Wiitala <miu@chromium.org>
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737230}