This removes the helper function in question that side-steps the
interpreter without going through the canonical UseIgnition predicate.
Having such a function is dangerous as it hides paths that are not yet
covered by the interpreter (like live edit in this case).

R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/1895763002

Cr-Commit-Position: refs/heads/master@{#35580}