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After r169941, the SVG leak tests reports failures, but delta is <0, so number of live nodes is not increasing. This CL loosen the check.

Also removes FIXME comments in the tests.

BUG=340522
NOTRY=true

Review URL: https://codereview.chromium.org/211933007

git-svn-id: svn://svn.chromium.org/blink/trunk@170010 bbb929c8-8fbe-4397-9dbb-9b2b20218538