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This CL moves RulesetManager::Action to its own file: request_action.h
This refactor is a precursor for RulesetMatcher to return actions when
actions contain a rule ID and source type.

Bug: 967942
Change-Id: Ia0ce3d48959509ed31d65d647a88a55ce2ead478
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1832625
Commit-Queue: Kelvin Jiang <kelvinjiang@chromium.org>
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#701701}