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This reverts commit 6a196c81.

Reason for revert: Unfortunately SVG files are not recognized as
tests in WPT, so moving these files into WPT actually means that we
stop running them altogether. See this CQ run:
https://ci.chromium.org/p/chromium/builders/try/linux-rel/303153

Original change's description:
> Move SMIL events tests to WPT
> 
> Change-Id: Ie4c00b4b6b6eba3b55f86793620a502780590864
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2041270
> Reviewed-by: Stephen Chenney <schenney@chromium.org>
> Commit-Queue: Fredrik Söderquist <fs@opera.com>
> Cr-Commit-Position: refs/heads/master@{#738955}

TBR=pdr@chromium.org,fs@opera.com,schenney@chromium.org

Change-Id: I09a5cde1c656ba765b710b7d5f01dd588c13da51
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2042125Reviewed-by: Robert Ma <robertma@chromium.org>
Commit-Queue: Robert Ma <robertma@chromium.org>
Cr-Commit-Position: refs/heads/master@{#739048}