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Change it to accept a dictionary instead of individual arguments for
better future compatibility. Note that this is a breaking change but
we'll reach out to the current users to make sure that they update their
extensions.

Skipping presubmit since this seems to be hitting crbug.com/956368.

BUG=1131746

No-Presubmit: True
Change-Id: Ia9e26e0f0da1694263b27a0d2aeff26562fce228
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2428300
Commit-Queue: Karan Bhatia <karandeepb@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812500}