Get rid of old flow thread comments and asserts in accumulateOffsetTowardsAncestor().
Get rid of old flow thread comments and asserts in accumulateOffsetTowardsAncestor().

R=chrishtr@chromium.org

Review URL: https://codereview.chromium.org/1198273003.

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@197641 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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