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This reverts commit 4562b3f8.

Reason for revert: This prevents the blink feature from being tested
for web tests. Will land crrev.com/c/2369263 first. We may not reland
this CL if we decide not to go through field trial.

Original change's description:
> Add blink::features::CompositeSVG
> 
> It corresponds to blink::RuntimeEnabledFeatures::CompositeSVGEnabled().
> This is to allow perf tests with CompositeSVG enabled by default with a
> testing variation.
> 
> Bug: 1101002
> Change-Id: If9a92b9eb56d0b242d8a46e397df71faa01577e6
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2373398
> Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
> Reviewed-by: Philip Rogers <pdr@chromium.org>
> Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#801382}

TBR=wangxianzhu@chromium.org,pdr@chromium.org,chrishtr@chromium.org

Change-Id: I8546a075b9d850a53e9117d12731ee9fe1ae3d6f
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1101002
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2375996Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801623}