Revert delayed frame destruction in SVGImage and the follow-up changes.

The frame destruction was delayed because Oilpan did not allow allocation during finalization. Oilpan now supports allocation during finalization and the delaying should not be necessary.

Keep the regression tests.

R=eseidel@chromium.org, fs@opera.com, kouhei@chromium.org, pdr@chromium.org
BUG=350907

Review URL: https://codereview.chromium.org/197793006

git-svn-id: svn://svn.chromium.org/blink/trunk@169233 bbb929c8-8fbe-4397-9dbb-9b2b20218538