Remove trace id mangling since it's been deprecated (and is also being
removed) in Chromium [1] and the actual id mangling operation was never
implemented in V8's version.

This patch doesn't introduce the upstream replacement
(TRACE_ID_{LOCAL,GLOBAL}), since nothing in V8 needs it and it'll be
shortly brought in with the transition to the Perfetto client library[2].

Bug: chromium:639003

[1] crbug.com/639003
[2] https://docs.google.com/document/d/1f7tt4cb-JcA5bQFR1oXk60ncJPpkL02_Hi_Bc6MfTQk/

Change-Id: Ifabda63b9c56918fafcc24dfc589b8e513a3f29b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2016592
Commit-Queue: Sami Kyöstilä <skyostil@chromium.org>
Commit-Queue: Peter Marshall <petermarshall@chromium.org>
Auto-Submit: Sami Kyöstilä <skyostil@chromium.org>
Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#65946}