Fix mb crash that would happen when we bailed out early.
Fix mb crash that would happen when we bailed out early.

If we bailed out early during 'mb gen' because a patch contained
modified .gn files, we would crash because we were invoking an
unknown method (due to a typo).

This CL fixes the typo.

TBR=phajdan.jr@chromium.org
BUG=454413

Review URL: https://codereview.chromium.org/1082393004

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#325152}

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