Fix element creation in wpt/svg/idlharness.window.js

Adjust casing for 'desc', 'switch' and 'mpath'. Remove a duplicate
'animateColor'.

BUG=868861

Change-Id: I19256547abea3028791de402e354c47eee8ce949
Reviewed-on: https://chromium-review.googlesource.com/1174261
Commit-Queue: Fredrik Söderquist <fs@opera.com>
Reviewed-by: Stephen Chenney <schenney@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582955}
2 files changed