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This reverts commit f79b1513.

Reason for revert: Breaks WebKit Linux MSAN

The following tests started failing since this landed:

* http/tests/devtools/tracing.js
* http/tests/devtools/tracing/decode-resize.js
* http/tests/devtools/tracing/timeline-paint/update-layer-tree.js
* http/tests/devtools/tracing/timeline-style/parse-author-style-sheet.js
* http/tests/devtools/tracing/tracing-record-input-events.js
* http/tests/devtools/tracing/user-timing.js
* http/tests/devtools/tracing/worker-events.js
* http/tests/devtools/tracing/worker-js-frames.js
* inspector-protocol/sessions/tracing-start.js
* inspector-protocol/timeline/tracing-proto-format.js

First run that failed, also the run where the CL landed:
https://ci.chromium.org/p/chromium/builders/ci/WebKit%20Linux%20MSAN/7830

Original change's description:
> [tracing] Remove special handling of task execution and log events
>
> The task execution and log events are handled specially for writing
> proto arguments because we did not have the support for typed events in
> base and interning support for the event macros. Now these events can
> use the new client library API.
> The events have to be migrated together because the source location
> interning index is common for all events in the API and does not
> account for the special handling in event sink.
>
> BUG=1136635
> TBR=chirantan@chromium.org
>
> Change-Id: I381e8c90e49c3fbd9ce4d8fb2e9db3d166b9b06d
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2462636
> Reviewed-by: ssid <ssid@chromium.org>
> Reviewed-by: Sami Kyöstilä <skyostil@chromium.org>
> Reviewed-by: danakj <danakj@chromium.org>
> Reviewed-by: Erik Chen <erikchen@chromium.org>
> Reviewed-by: Eric Seckler <eseckler@chromium.org>
> Commit-Queue: ssid <ssid@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#815911}

TBR=danakj@chromium.org,chirantan@chromium.org,erikchen@chromium.org,skyostil@chromium.org,ssid@chromium.org,eseckler@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 1136635
Change-Id: I7a84356400bbdcae3144fd65afdcab7a4407dcd9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2462895Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Commit-Queue: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816069}