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This makes more sense to me, since (1) the controller shouldn't have to
know, and (2) the parameters are owned by the trigger context anyway.

This is a refactoring only and should have no user-facing changes.

Change-Id: I06da79a4215a12df66bf5f69f7a2634ba34f43ae
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2356504
Auto-Submit: Clemens Arbesser <arbesser@google.com>
Commit-Queue: Luca Hunkeler <hluca@google.com>
Reviewed-by: Luca Hunkeler <hluca@google.com>
Cr-Commit-Position: refs/heads/master@{#798556}