Revert "Perfetto: Enable by default everywhere"

This reverts commit ceee653f25a17f315e625326d8bb07dff4ab49ab.

Reason for revert: Builders failed on WebKit Linux Trusty.
See https://bugs.chromium.org/p/chromium/issues/detail?id=942956

Original change's description:
> Perfetto: Enable by default everywhere
> 
> This enables Perfetto (https://www.perfetto.dev/) by default as the new
> backend for the Chrome tracing system (what drives about://tracing).
> 
> R=​ssid@chromium.org
> TBR=nasko@chromium.org
> 
> Bug: 839084
> Change-Id: I6a239424aaa69aa38143ec10f30636c12e858d29
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1508695
> Reviewed-by: oysteine <oysteine@chromium.org>
> Reviewed-by: Nasko Oskov <nasko@chromium.org>
> Reviewed-by: ssid <ssid@chromium.org>
> Commit-Queue: oysteine <oysteine@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#641407}

TBR=nasko@chromium.org,oysteine@chromium.org,ssid@chromium.org

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

Bug: 839084, 942956
Change-Id: Ic21410739ffe196210d28226e4c405593cda7ac6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1524760
Reviewed-by: Yoichi Osato <yoichio@chromium.org>
Commit-Queue: Yoichi Osato <yoichio@chromium.org>
Cr-Commit-Position: refs/heads/master@{#641522}
7 files changed