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Instead, add a callback and only call exit in the CLI version

Bug: 1044513
Change-Id: Ic0fafb21fea42bf48434c38243f9ba27935eb526
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2019789
Commit-Queue: Victor Vasiliev <vasilvv@chromium.org>
Reviewed-by: Ryan Hamilton <rch@chromium.org>
Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735318}