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This removes process_name and thread_name from trace log, these fields
are now recorded in perfetto, so it's not necessary to record them
client side.

Change-Id: I6591c25d572cd97b54d024ffcb3dcc00597d63fa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2640819Reviewed-by: ssid <ssid@chromium.org>
Commit-Queue: Salvador Guerrero <salg@google.com>
Cr-Commit-Position: refs/heads/master@{#846445}