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Coping the strings used in tracing is not necessary because the used
strings are static literals.
Also this is not necessary in case of values
(not category/event/argument names) passed to trace events.

Bug: chromium:1025973
Change-Id: Iabd03e8bf54353663d886c9bb53b7daaa4001919
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1934772Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Commit-Queue: Behdad Bakhshinategh <behdadb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#719620}