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Currently rebase_path() function takes up to three parameters, so
passing a fourth won't work.

This was probably due to the work done in:
https://chromium.googlesource.com/chromium/src/+/ee55eaceea8d7632a59761c603af0f4503db00df

BUG=434539
TEST=gn help rebase_path
R=scottmg@chromium.org

Review URL: https://codereview.chromium.org/892043004

Cr-Commit-Position: refs/heads/master@{#314097}