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This replaces the previous mojo interface parameter for specifying the
priority of a tracing session with an equivalent setting in the Perfetto
trace config. This patch doesn't change the effective priority of existing
tracing sessions; only the redundant parallel setting is removed.

Bug: 1058632
Change-Id: I0f71edcf65c564df286191be4634555a09f93473
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2414253
Auto-Submit: Sami Kyöstilä <skyostil@chromium.org>
Reviewed-by: Leonard Grey <lgrey@chromium.org>
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Reviewed-by: ssid <ssid@chromium.org>
Commit-Queue: Nasko Oskov <nasko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814014}