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The SVG instance tree was recently removed which also removed most of the gnarly event handling in SVG. Now we can support SVG also in event.path.

BUG=402721

Review URL: https://codereview.chromium.org/477883003

git-svn-id: svn://svn.chromium.org/blink/trunk@180364 bbb929c8-8fbe-4397-9dbb-9b2b20218538